20100214.ba v04_n315.bam.20100214 >From ???@??? Sun Feb 14 11:52:25 2010 -0600 Date: Sun, 14 Feb 2010 11:52:21 CST From: Old Tube Radios To: Old Tube Radios Subject: BOATANCHORS digest 4315 Message-Id: <20100214175221.D3512291BA9@minime.theporch.com> BOATANCHORS Digest 4315 Topics covered in this issue include: 1) The late Mike Hardie, VE7MMH/VA7MH - SK by "Ed Sieb" 2) Re: If You Need a Regulated Low B+ Supply by "David Stinson" 3) Re: Loran-C Saved? by rdavis7@comcast.net 4) Re: Loran-C Saved? by "Al Parker" 5) IF transformers by "Paul Kraemer" 6) Re: Loran-C Saved? by "raymond Cote" 7) Re: IF transformers by Roy Morgan 8) Re: IF transformers by "Arden Allen" 9) Re: Loran-C Saved? by Roy Morgan 10) Loran-C Saved? by Jerry Proc 11) Re: Loran-C Saved? by Tom Norris 12) Prewar Transmitter by "Wilson Lamb" 13) Re: Prewar Transmitter by Al Klase 14) Transformer needed for adjustable HV supply. by Tom Norris 15) Re: Prewar Transmitter by wa1kbq@aol.com 16) Re: IF transformers by "Paul Kraemer" 17) Re: Transformer needed for adjustable HV supply. by "David Stinson" ---------------------------------------------------------------------- Message-ID: From: "Ed Sieb" To: Old Tube Radios Subject: The late Mike Hardie, VE7MMH/VA7MH - SK Date: Sat, 13 Feb 2010 14:09:30 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit The late Mike Hardie, VE7MMH/VA7MH - SK Dear Friends, I am Mike Hardie's daughter, Elizabeth, and I am writing to inform you of his recent passing. Please excuse this email if you have received it in error. I am trying to find and let his friends from his beloved "radio community" know. Should you have any questions, please don't hesitate to contact me at elizabethhardie@hotmail.com Sincerely, Elizabeth HARDIE, Michael Moran June 18, 1946 Feb. 7, 2010 On February 7, 2010 the world lost one of the good guys. Major Mike Hardie passed away suddenly while working in the British Virgin Islands. Born to Elizabeth Rose and John Alexander Hardie, Mike left his North Vancouver home to start a career as a fighter pilot with the Canadian Air Force. After thirteen years of beating the sound barrier on bases all over Canada, Mike left the Air Force and returned to his roots on the North Shore with his growing family. He spent the remainder of his career with the federal government as a civil aviation inspector. Mike's greatest joys were his wife, family and friends. He is survived by his wife and constant companion of forty years, Therese (Mayea), and children John (Jessie), Peter (Kirsti), Patrick (Lisa), Elizabeth (Dustin), Michael (Renee) and Lorraine. Mike could be found with a spring in his step taking his three grandchildren: Nathan, Noah, and Madeleine on walks to the park. A generous man who shared his talents for all things mechanical, Mike was often asked by family and friends to help repair cars, appliances, electronic equipment and home improvements. Whenever asked if he could help fix something, his answer was always, "Bring it over and we'll have a look". For the last decade, Mike was a Ham Radio and Morse Code operator. He enjoyed refurbishing radios from the 1940's and 1950's. His absence will leave a void in the airwaves. Mike exemplified integrity, wisdom, loyalty and hard work. He leaves a legacy to be treasured by all who knew him. A memorial service will be held in Mike's honour on February 20th, 2010 at 11:00am at The Church of Jesus Christ of Latter Day Saints 941 Lynn Valley Road. ------------------------------ Message-ID: From: "David Stinson" To: Old Tube Radios Subject: Re: If You Need a Regulated Low B+ Supply Date: Sat, 13 Feb 2010 13:50:07 -0600 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit This cute little circuit is an example of the kind of DC/DC converter you cannot stack, since in and out have a common ground: http://www.nbglin.com/dc.htm Still a neat circuit, though. I'm gonna get me a couple to use as "Borg Implants." 73 Dave S. ------------------------------ Date: Sat, 13 Feb 2010 19:52:20 +0000 (UTC) From: rdavis7@comcast.net To: Old Tube Radios Cc: Old Tube Radios Message-ID: <1190085949.3623991266090740976.JavaMail.root@sz0164a.emeryville.ca.mail.comcast.net> Subject: Re: Loran-C Saved? MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_193482_1873481009.1266090740975" ------=_Part_193482_1873481009.1266090740975 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Well unless you've got better information than admiral Thad Allen, Commandant USCG its down now with a few stations in the Aleutian chain and two in Alaska. By agreement with the Soviets these few will remain operational a while longer. Rick K8PJQ USCG ----- Original Message ----- From: "Jerry Proc" To: "Old Tube Radios" Sent: Saturday, February 13, 2010 12:12:14 PM GMT -05:00 US/Canada Eastern Subject: Loran-C Saved? Hello Everyone, President Obama has reversed the decision to shut down Loran-C provided it can be staffed by volunteer amateur radio operators. It was supposed to shut down on Feb 8/10. http://thek3ngreport.blogspot.com/2010/02/radio-amateur-volunteers-to-save-loran.html -- Regards, Jerry Proc E-mail: jerry7proc@yahoo.com __________________________________________________________________ Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your favourite sites. Download it now http://ca.toolbar.yahoo.com. ------=_Part_193482_1873481009.1266090740975 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ---REMAINDER OF MESSAGE TRUNCATED--- * * This post contains a forbidden message format * * (such as an attached file, a v-card, HTML formatting) * * Mail Lists at theporch.com only accept PLAIN TEXT * * If your postings display this message your mail program * * is not set to send PLAIN TEXT ONLY and needs adjusting * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ------=_Part_193482_1873481009.1266090740975-- ------------------------------ Message-ID: From: "Al Parker" To: Old Tube Radios Subject: Re: Loran-C Saved? Date: Sat, 13 Feb 2010 15:13:10 -0500 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Hi all, I think K3NG is NG in his opinions or spam stories, or whatever it is he does. Take a look at a real newpaper website, posted yesterday: http://www.adn.com/news/military/story/1137265.html 73, Al, W8UT ----- Original Message ----- From: "Jerry Proc" To: "Old Tube Radios" Sent: Saturday, February 13, 2010 12:12 PM Subject: Loran-C Saved? > Hello Everyone, > > President Obama has reversed the decision to shut down Loran-C provided it > can be staffed by volunteer amateur radio operators. It was supposed to > shut down on Feb 8/10. > > http://thek3ngreport.blogspot.com/2010/02/radio-amateur-volunteers-to-save-loran.html > > -- > Regards, > Jerry Proc > E-mail: jerry7proc@yahoo.com > ------------------------------ Message-ID: <24686E8C09C741E6881F3A13523DA1D0@ENGR2> From: "Paul Kraemer" To: Old Tube Radios Subject: IF transformers Date: Sat, 13 Feb 2010 16:05:24 -0600 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="Windows-1252"; reply-type=original Content-Transfer-Encoding: 7bit Anyone had any experience repairing the K tran style if transformers like used in HQ-100 and many others? This is in reference to the riveted plate affair in the bottom that forms the capacitors needed to resonate the windings. I have one that the assembly is loose. I don't see an effective way to tighten the rivet. My gut says Dremel it out and replace with two sm caps the correct value but would rather excercise a little caution and ask if someone else had the same experience and how they corrected it. Thanks in advance Paul K0UYA ------------------------------ Message-ID: <028EE73723154F338C6BD0B2070DF658@raymondhome> From: "raymond Cote" To: Old Tube Radios Subject: Re: Loran-C Saved? Date: Sat, 13 Feb 2010 15:06:52 -1000 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Questions yes, also volunteers that want to go to Jan Mayan Island....a site that I used extensively working up by the Arctic circle You have to look it up on google earth to get an idea of it's remoteness. ================================= ----- Original Message ----- From: "B. Smith" To: "Old Tube Radios" Sent: Saturday, February 13, 2010 7:55 AM Subject: Re: Loran-C Saved? > I guess ARRL will have to put some Loran C questions in the question pool > that everyone memorizes. > > 73 > ------------------------------ From: Roy Morgan To: Old Tube Radios Subject: Re: IF transformers Message-Id: <2704D85D-C2EC-45D1-9594-3FDE3E66C773@earthlink.net> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v936) Date: Sat, 13 Feb 2010 22:06:27 -0500 Cc: Old Tube Radios On Feb 13, 2010, at 5:05 PM, Paul Kraemer wrote: > Anyone had any experience repairing the K tran style if transformers > like used in HQ-100 and many others? > This is in reference to the riveted plate affair in the bottom that > forms the capacitors needed to resonate the windings. Paul, I've not had to fix one but it is well established that leakage and change in value happen in these transformers. The cure I remember being offered is to extract the built-in capacitor however you can and put a new silver mica cap into the circuit instead. - The dremel tool may help a lot - you can get good SM caps at www.justradios.com Roy Roy Morgan k1lky@earthlink.net 529 Cobb St. Groton NY, 13073 Home: 607-898-3607 Cell: 301-928-7794 ------------------------------ Message-ID: <002c01caad22$a2447850$f49d480c@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: IF transformers Date: Sat, 13 Feb 2010 19:05:23 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit > ..... My gut says Dremel it out and replace with two sm caps the correct value but > would rather excercise a little caution and ask if someone else had the same > experience and how they corrected it. K-trans are susceptable to corrosion of the silvering on the micas as they are open to the air and moisture ingress finally ruins them. I repaired a dozen or more. Your gut is right. Replacing the caps is preferable to trying to restore reliable contacting, IMO, based on results. After unsoldering the coil wires I remove the micas, stabilize the terminals with epoxy, and solder new 300V resin dipped micas to the contacting fingers. Clean flux away with alcohol, acetone will dissolve the plastic framwork. Preform, clean and pre tin leads and surfaces to be soldered so that you can solder the caps in quickly without melting the framework. Slip thick paper under the contact fingers for a heat barrier. Arden Allen KB6NAX Adopt a shelter dog, save an innocent life, and make a friend forever =:-) ------------------------------ From: Roy Morgan To: Old Tube Radios Subject: Re: Loran-C Saved? Message-Id: <9F595622-5D9A-4247-B288-02D146C2FD3A@earthlink.net> Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=yes Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Apple Message framework v936) Date: Sat, 13 Feb 2010 22:28:23 -0500 Cc: Old Tube Radios On Feb 13, 2010, at 8:06 PM, raymond Cote wrote: > Questions yes, also volunteers that want to go to Jan Mayan =20 > Island....a site that I used extensively working up by the Arctic =20 > circle > > You have to look it up on google earth to get an idea of it's =20 > remoteness. I found it Jan MayEn) in wikipedia and then via Google Earth at: 70=C2=B059=E2=80=B2N, 8=C2=B032=E2=80=B2W NONE of the pictures I saw showed any vegitation. If you look close at =20= the picture whose caption is "Danger, Bware!" I think you see a =20 thousand+ foot tower, but the Loran station seems not to have a picture. Roy Roy Morgan k1lky@earthlink.net 529 Cobb St. Groton NY, 13073 Home: 607-898-3607 Cell: 301-928-7794 ------------------------------ Message-ID: <207205.17779.qm@web112311.mail.gq1.yahoo.com> Date: Sat, 13 Feb 2010 19:56:45 -0800 (PST) From: Jerry Proc Subject: Loran-C Saved? To: Old Tube Radios MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Hello Everyone, The e-mail I sent earlier today about Loran C being saved if it could be operated by amateur radio volunteers appears to be a hoax. Perhaps April Fool's day came early this year. Sorry about the message. I wrote to the United States Coast Guard about the reprieve and as far as they are concerned, the system is shut down. End of story. ***** RESPONSE FORM USCG GREETINGS: Thank you for your report regarding the absence of LORAN signal availability. In accordance with the DHS Appropriations Act, the U.S. Coast Guard has terminated the transmission of all U.S. LORAN-C signals effective 2000Z 08 Feb 2010. At this time, the U.S. LORAN-C signal will be unusable and permanently discontinued. This termination does not affect U.S. participation in the Russian American or Canadian LORAN-C chains. U.S. participation in these chains will continue in accordance with international agreements. The Canadian Coast Guard has also issued a statement, which is shown on their website. You may view the estimated remaining LORAN-C signal coverage areas of these international chains at Date: Sun, 14 Feb 2010 02:27:20 -0600 Content-Transfer-Encoding: quoted-printable Message-Id: To: Old Tube Radios More satire than hoax the way I read it - a lot of folks, from labs that = can't afford a GPS or Cesium standard, to nav users to many of us are a = bit miffed at Loran's termination. But, time marches on, things = progress - in this case it didn't HAVE to. Tom On Feb 13, 2010, at 9:56 PM, Jerry Proc wrote: > Hello Everyone, >=20 > The e-mail I sent earlier today about Loran C being saved if it could = be operated by amateur radio volunteers appears to be a hoax. Perhaps = April Fool's day came early this year. Sorry about the message. I wrote = to the United States Coast Guard about the reprieve and as far as they = are concerned, the system is shut down. End of story. =20 >=20 > ***** > RESPONSE FORM USCG >=20 > GREETINGS: >=20 > Thank you for your report regarding the absence of LORAN signal = availability.=20 >=20 > In accordance with the DHS Appropriations Act, the U.S. Coast Guard = has terminated the transmission of all U.S. LORAN-C signals effective = 2000Z 08 Feb 2010. At this time, the U.S. LORAN-C signal will be = unusable and permanently discontinued. >=20 > This termination does not affect U.S. participation in the Russian = American or Canadian LORAN-C chains. U.S. participation in these chains = will continue in accordance with international agreements. The Canadian = Coast Guard has also issued a statement, which is shown on their = website.=20 >=20 > You may view the estimated remaining LORAN-C signal coverage areas of = these international chains at = =20 > The Coast Guard strongly urges mariners currently using LORAN-C for = navigation to shift to a GPS navigation system and become familiar with = its operation as soon as possible.=20 >=20 > The decision to cease transmission of the LORAN-C signal reflects the = president's pledge to eliminate unnecessary federal programs. >=20 > If you have any further questions regarding LORAN please contact the = Department of Homeland Security (DHS) Public Affairs Office at = 202-282-8010.=20 >=20 > Sincerely, >=20 > USCG Navigation Center > Navigation Information Service > NAVCEN MS 7310 > 7323 Telegraph Road > Alexandria, VA 20598 - 7310 > Tel: 703-313-5900 > www.navcen.uscg.gov >=20 > The following question or comment was submitted via the Navigation = Center website 2/13/2010 at 3:31:44 PM. >=20 >=20 > If you are a subject matter expert, please DO NOT reply to the person = that submitted the message. The NAVCEN NIS is responsible for = responding to all inquiries and may contact you for assistance. >=20 >=20 > 1. Subject: LORAN >=20 > 2. Name: Jerry Proc >=20 > 3. Telephone number: xxxxxxxxxxx >=20 > 4. Email Address: jerry.proc@sympatico.ca >=20 > 6. IP Address: 70.54.20.236 >=20 > 7. Comments or Questions: Hello USCG, >=20 > Is it true that President Obama made a decision on Feb 11 to postpone = the closure of the Loran-C system provided it can be staffed by = volunteer amateur radio operators? I have not seen anything about that = decision on this web site? >=20 >=20 > -- > Regards, > Jerry Proc > E-mail: jerry7proc@yahoo.com >=20 >=20 > = __________________________________________________________________ > Connect with friends from any web browser - no download required. Try = the new Yahoo! Canada Messenger for the Web BETA at = http://ca.messenger.yahoo.com/webmessengerpromo.php >=20 ------------------------------ Message-ID: <2A109BC2FB1C474C9893B437E300D6FB@wilsonspc> From: "Wilson Lamb" To: Old Tube Radios Cc: Subject: Prewar Transmitter Date: Sun, 14 Feb 2010 10:21:54 -0500 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit I'm looking for a prewar transmitter to be roughly age compatible with my Comet Pro. I know about Leeds, Gross, Thordarson, but they are all crystal controlled, I think. I also know about the Signal Shifter and Variarm VFO. Is there a more powerful, 20+Watts, rig with integral VFO for which I could be looking. 73, Wilson W4BOH ------------------------------ Message-id: <4B781AA6.8080703@ar88.net> Date: Sun, 14 Feb 2010 10:45:42 -0500 From: Al Klase MIME-version: 1.0 To: Old Tube Radios Cc: Old Tube Radios Subject: Re: Prewar Transmitter Content-type: multipart/alternative; boundary=------------030304000200030208090707 This is a multi-part message in MIME format. --------------030304000200030208090707 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Wilson, In the Comet-Pro era, the vast majority of transmitters were homebrew. Al On 2/14/2010 10:21 AM, Wilson Lamb wrote: > I'm looking for a prewar transmitter to be roughly age compatible with > my Comet Pro. > I know about Leeds, Gross, Thordarson, but they are all crystal > controlled, I think. > I also know about the Signal Shifter and Variarm VFO. > Is there a more powerful, 20+Watts, rig with integral VFO for which I > could be looking. > 73, > Wilson > W4BOH -- Al Klase - N3FRQ Jersey City, NJ http://www.skywaves.ar88.net/ --------------030304000200030208090707 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ---REMAINDER OF MESSAGE TRUNCATED--- * * This post contains a forbidden message format * * (such as an attached file, a v-card, HTML formatting) * * Mail Lists at theporch.com only accept PLAIN TEXT * * If your postings display this message your mail program * * is not set to send PLAIN TEXT ONLY and needs adjusting * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * --------------030304000200030208090707-- ------------------------------ From: Tom Norris Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Subject: Transformer needed for adjustable HV supply. Date: Sun, 14 Feb 2010 10:55:03 -0600 Message-Id: To: Old Tube Radios Mime-Version: 1.0 (Apple Message framework v1077) I have this decent, but not currently usable classroom-type HV supply = I'd like to get up and running. It's a very light-weight 70's vintage = "Lock Science" UK thingie. I found out why it was a gimme! 220 v = primary only. Would be less expensive to simply replace the original = tranny with another than have a step-up transformer taking up room in my = already cramped work area. =20 I doubt I'll find a replacement transformer as a single unit, but I am = looking for something with 120 vac input with the following outputs -- = 2 each 6.3 at 2A, single ended 300V at 120mA, and 50V CT 80 mils for = bias. "Close Enough" is fine, it can have any number of filament = windings, even one will do, with 5 vAC for the second. HV may be single = ended or CT, bias can be anything -- would prefer *more* than 50 volts, = actually. The kicker is the original fits in a 5x5 inch space. A = generic replacement will give me most of the voltages, probably less the = bias. Still room for it in the case. Probably room for a second HV = source as well (thinking separate screen supply) When all is said and done, I may end up modding the B+ to take a = regulator, particularly if I add an additional screen output. Plenty = room for (gasp) solid-state devices. I wish I hadn't gotten rid of the majority of my junk-box items or I'd = probably *have* a replacement. Thanks for any help! Tom NU4G= ------------------------------ To: Old Tube Radios Subject: Re: Prewar Transmitter Date: Sun, 14 Feb 2010 11:44:04 -0500 MIME-Version: 1.0 From: wa1kbq@aol.com Content-Type: multipart/alternative; boundary="--------MB_8CC7BAC0D5AB35F_8D6C_305BD_webmail-m009.sysops.aol.com" Message-Id: <8CC7BAC0D4ECC7F-8D6C-1864D@webmail-m009.sysops.aol.com> ----------MB_8CC7BAC0D5AB35F_8D6C_305BD_webmail-m009.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" Commercially produced Amateur transmitters of the Thirties are fairly diff= icult to find now as not many survived over the years. There are a few out= there but even for an experienced collector it takes a lot of effort and= networking with other collectors to turn one up. Maybe watch estate sales= and auctions as they are often highly prized and usually not sold while= the owner is still living. My pre-war stuff includes a 1935 Harvey Radio= Labs CT-60 and a 1935 Wholesale Radio Company P-46. Both are plug-in coil= rigs mounted in their original table rack cabinets with modulators and po= wer supplies. 73, Greg -----Original Message----- From: Wilson Lamb To: Old Tube Radios Cc: boATANCHORS@theporch.com Sent: Sun, Feb 14, 2010 10:21 am Subject: Prewar Transmitter I'm looking for a prewar transmitter to be roughly age compatible with my= Comet Pro.=20 I know about Leeds, Gross, Thordarson, but they are all crystal controlled= , I think.=20 I also know about the Signal Shifter and Variarm VFO.=20 Is there a more powerful, 20+Watts, rig with integral VFO for which I coul= d be looking.=20 73,=20 Wilson=20 W4BOH =20 ----------MB_8CC7BAC0D5AB35F_8D6C_305BD_webmail-m009.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ---REMAINDER OF MESSAGE TRUNCATED--- * * This post contains a forbidden message format * * (such as an attached file, a v-card, HTML formatting) * * Mail Lists at theporch.com only accept PLAIN TEXT * * If your postings display this message your mail program * * is not set to send PLAIN TEXT ONLY and needs adjusting * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ----------MB_8CC7BAC0D5AB35F_8D6C_305BD_webmail-m009.sysops.aol.com-- ------------------------------ Message-ID: From: "Paul Kraemer" To: Old Tube Radios Subject: Re: IF transformers Date: Sun, 14 Feb 2010 11:48:40 -0600 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="Windows-1252"; reply-type=response Content-Transfer-Encoding: 7bit Thanks to all the great help, tips, suggestions on the HQ if can repair I stabilized the lugs with the quick set epoxy and will tackle getting the old caps out and sm replacements in after the lugs are set I did not remove the hair like wires or disturb any of that structure Looks to me like the rivet, plate, and caps can be extracted without disturbing the internal wiring Paul K0UYA ------------------------------ Message-ID: <671260B66F7D410AA77B9076BE2013D5@boudreaux> From: "David Stinson" To: Old Tube Radios Subject: Re: Transformer needed for adjustable HV supply. Date: Sun, 14 Feb 2010 11:51:55 -0600 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit "Electronic/computer/appliance" stores sell power converters that people going to Europe (220 VAC mains) use for their stuff. A 1000 watt unit is only $16. Your time is worth more than that. Here's a link to some at Fry's: http://www.frys.com/product/1769535?site=sr:SEARCH:MAIN_RSLT_PG http://www.frys.com/product/2508451?site=sr:SEARCH:MAIN_RSLT_PG http://www.frys.com/product/1769524?site=sr:SEARCH:MAIN_RSLT_PG Aside: Back-feeding the transformer types with 110 vac might make a nice B+ transformer for a receiver. 73 Dave S. ----- Original Message ----- From: "Tom Norris" To: "Old Tube Radios" Sent: Sunday, February 14, 2010 10:55 AM Subject: Transformer needed for adjustable HV supply. I have this decent, but not currently usable classroom-type HV supply I'd like to get up and running. It's a very light-weight 70's vintage "Lock Science" UK thingie. I found out why it was a gimme! 220 v primary only. Would be less expensive to simply replace the original tranny with another than have a step-up transformer taking up room in my already cramped work area. I doubt I'll find a replacement transformer as a single unit, but I am looking for something with 120 vac input with the following outputs -- 2 each 6.3 at 2A, single ended 300V at 120mA, and 50V CT 80 mils for bias. "Close Enough" is fine, it can have any number of filament windings, even one will do, with 5 vAC for the second. HV may be single ended or CT, bias can be anything -- would prefer *more* than 50 volts, actually. The kicker is the original fits in a 5x5 inch space. A generic replacement will give me most of the voltages, probably less the bias. Still room for it in the case. Probably room for a second HV source as well (thinking separate screen supply) When all is said and done, I may end up modding the B+ to take a regulator, particularly if I add an additional screen output. Plenty room for (gasp) solid-state devices. I wish I hadn't gotten rid of the majority of my junk-box items or I'd probably *have* a replacement. Thanks for any help! Tom NU4G ------------------------------ End of BOATANCHORS Digest 4315 ******************************