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Author Topic: Alpha 77 DX/SX  (Read 1381 times)
KZ2P
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« on: November 01, 2012, 02:27:22 PM »

Has anyone replaced the original Alpha 77 DX/SX transformer with the Peter Dahl A77S-1 (1800/3200 vac) and/or A77S-3 (1800/3000 vac) transformer(s)?  If so, did you encounter any problems?

                                        73 & thanks Jim KZ2P
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W9GB
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« Reply #1 on: November 01, 2012, 04:07:12 PM »

Jim --

Have you talked to Jim Byrd, N4UQ ??

K7JI has a YouTube video (March 30, 2011) of the A77S-4 Peter Dahl upgrade (2400/3400 VAC @ 0.9 A).
http://m.youtube.com/#/watch?feature=youtube_gdata_player&v=JvyYces6wf4&desktop_uri=%2Fwatch%3Fv%3DJvyYces6wf4%26feature%3Dyoutube_gdata_player
« Last Edit: November 01, 2012, 04:20:03 PM by W9GB » Logged
KZ2P
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« Reply #2 on: November 02, 2012, 06:53:33 AM »

Greg,
Thanks.  Dick advised against that transformer - too many modifications required to accommodate the increased voltage.  That's the reason that I am looking for information on the other ones.
                                           73 - Jim
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W9GB
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« Reply #3 on: November 02, 2012, 07:32:00 AM »

Quote from: KZ2P
Dick Byrd advised against that transformer - too many modifications required to accommodate the increased voltage.
Jim -

Thanks for that information.  I remember when the the ETO Alpha 70 and 77 amplifiers were new !
There was a commercial version of these amplifiers mfg. for low VHF-TV (2-6) translators in late 1960s / early 1970s.  I had a chance to buy (cheap) one of those as surplus 35 years ago, lost opportunity.

Did Dick make any comments about the S-1 or S-3 replacement models?

w9gb
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KZ2P
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« Reply #4 on: November 02, 2012, 01:03:19 PM »

Dick never mentioned the other 2 transformers.  He just said that he didn't want to get involved with the A77S-4.
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