Re: [AMRadio] Driver Xfmr
In a message dated 2/6/03 7:25:39 PM, [EMAIL PROTECTED] writes: > Just put a resistor in the plate of the > audio driver tube, in place of the transformer primary. I think around > 10k 2 watt will work ok. Then couple the plate of the driver to the grid > of one of the 1625s with a capacitor. Leave the secondary of the driver > transformer hooked to both grids and bias as it was. > It will work as an auto transformer to couple audio into both tubes. > Works fine! Although gain will be somewhat less than with the transformer. > I've done this too with FB results as long as one is not trying to push any power into the next stage, but only providing a voltage swing. Never had a DX-100 so have to ask, in just what class are the 1625 modulator tubes operating i.e., AB1 or AB2? If AB1 the scheme under discussion (or a phase inverter, or an itty-bitty transformer) should work FB. Nada if AB2. Dennis D. W7QHO Glendale, CA --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. To learn how to post in Plain-Text go to: http://www.expita.com/nomime.html ---
[AMRadio] Re: Driver Transformer
Mike, Check your E-Mail I have the transformer Bob, W4WSZ MIke Wells wrote: Hello, I just lost the audio driver xfmr in my DX-100. I turned it on to warm up and a few minutes later the house filled with the familiar smell. Anyone have a parts unit or advise as where I might find a replacement? Thanks Mike W0FD ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Driver Xfmr
Hi Mike, If it is the primary of the transformer that opened (usually is) you can still use it to get you buy. Just put a resistor in the plate of the audio driver tube, in place of the transformer primary. I think around 10k 2 watt will work ok. Then couple the plate of the driver to the grid of one of the 1625s with a capacitor. Leave the secondary of the driver transformer hooked to both grids and bias as it was. It will work as an auto transformer to couple audio into both tubes. Works fine! Although gain will be somewhat less than with the transformer. Be sure to check to see what shorted to take out the transformer. Maybe the tube. 73 Gary K4FMX MIke Wells wrote: Hello, I just lost the audio driver xfmr in my DX-100. I turned it on to warm up and a few minutes later the house filled with the familiar smell. Anyone have a parts unit or advise as where I might find a replacement? Thanks Mike W0FD ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio
RE: [AMRadio] Driver Xfmr
Mike, I tend to get rid of them when they fail, and use AB1 with KT88 or KT90 tubes. Another transformer will do, but you have to find a place to put it. The original was that very little piece of crap, and you wont find a substitute other than the original type to fit. Best to put something bigger in anyway, or none at all! Contrast the dx100 driver with the big one in the 32v series! Brett N2DTS > > > Hello, > > I just lost the audio driver xfmr in my DX-100. I turned it > on to warm up > and a few minutes later the house filled with the familiar > smell. Anyone > have a parts unit or advise as where I might find a replacement? > > Thanks > Mike > W0FD > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Driver Xfmr
Mike- I just went through the same problem with my 32V-1. I found that the Hammond 1:3 interstage transformer at AES would work. (I didn't try it though, as I got an original 32V xfmr). -Tony
[AMRadio] Variac
Thanks to all that offer suggestions and tips regarding the wiring-up of my newly acquired Variac. 73 and I hope to be on 10 meter AM this weekend with a Viking II and 75A4. Steve Fitzgerald N4KQR Tampa FL
Re: [AMRadio] Driver Xfmr
Mike, What is the part number on the side of the transformer? Bob, W4WSZ At 01:17 PM 2/6/03 -0700, you wrote: Hello, I just lost the audio driver xfmr in my DX-100. I turned it on to warm up and a few minutes later the house filled with the familiar smell. Anyone have a parts unit or advise as where I might find a replacement? Thanks Mike W0FD ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] Driver Xfmr
Hi Mike Peter Dahl has DX-100 drivers for $120.00 (915-751-2300). There are 3 DX-100's in the ER parts directory: Abe Levy 302-349-5389 Darryl Dippel POB 335, La Grange TX, 78945 William Swiger 304-842-4635 73 Ray, NØDMS - Original Message - From: "MIke Wells" <[EMAIL PROTECTED]> To: "AM Radio List" Sent: Thursday, February 06, 2003 1:17 PM Subject: [AMRadio] Driver Xfmr > Hello, > > I just lost the audio driver xfmr in my DX-100. I turned it on to warm up > and a few minutes later the house filled with the familiar smell. Anyone > have a parts unit or advise as where I might find a replacement? > > Thanks > Mike > W0FD > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > >
[AMRadio] Driver Xfmr
Hello, I just lost the audio driver xfmr in my DX-100. I turned it on to warm up and a few minutes later the house filled with the familiar smell. Anyone have a parts unit or advise as where I might find a replacement? Thanks Mike W0FD
Re: [AMRadio] Variac hook up
hi... The variacs I have used (Powerstat) were set up like this; 2 ---) ) ) 4 ---) ) ) ) <--- 3 ) ) ) 1 But be sure you do the ohmeter tests and make sure you know where the 'variable' arm is connect... a good 'eye' inspection should tell you which one that is 73 Vince ka1iic Homeland Security? You be the judge see: http://w3.ime.net/~ka1iic
Re: [AMRadio] Variac hook up
Steve, using a ohmmeter, Find out which terminal is the wiper arm- this is the hot side of the output. The cold side of the output is also the neutral terminal. The other side of the winding is the hot side of the line.Again hook up the line side to each end of the windings, the neutral side is common to input and output. The output terminals are the wiper and neutral. Russ. From: "Steve Fitzgerald" <[EMAIL PROTECTED]> Reply-To: amradio@mailman.qth.net To: Subject: [AMRadio] Variac hook up Date: Tue, 4 Feb 2003 17:55:00 -0500 Hello, I bought a 20 amp 110 volt variac from an estate this past weekend. I would like to know what is the correct way to hook up the beast. It is made by American Transformer Co. and the catalog number is 27666. It has four terminals marked 1,2,3 and 4. Can I assume that 1 and 2 are input and 3,4 are output? Thank you, Steve Fitzgerald N4KQR Tampa FL ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio _ The new MSN 8: smart spam protection and 2 months FREE* http://join.msn.com/?page=features/junkmail
