- 1. [Amps] ALPHA 9500 Question (Fault 21) (score: 1)
- Author: "David B. Ritchie" <dbritchie@gmail.com>
- Date: Fri, 28 Oct 2016 15:46:16 -0700
- Hello - I am getting Fault 21 on my Alpha 9500. The Fault Decoder Sheet from their website says it has to do with the Cathode +40V bias PS. It suggests that it might be a shorted tube. The tube is no
- /archives//html/Amps/2016-10/msg00138.html (7,723 bytes)
- 2. [Amps] Alpha 9500 Autotune (score: 1)
- Author: "David B. Ritchie" <dbritchie@gmail.com>
- Date: Sun, 4 Dec 2016 13:17:58 -0800
- I have a 9500 and I run it mostly with a Steppir DB36. I leave Autotune ON - all the time. Works fine - but yes - it does occasionally adjust - makes a small clunking sound. With a fixed impedance an
- /archives//html/Amps/2016-12/msg00073.html (7,733 bytes)
- 3. [Amps] Alpha Service (score: 1)
- Author: "David B. Ritchie" <dbritchie@gmail.com>
- Date: Tue, 10 Jan 2017 09:19:29 -0800
- Can anyone recommend a good way to get Alpha (or whatever they are now) to repair a 9500 - or alternatively recommend a third party who is good? I cannot seem to get them to respond to emails. Thank
- /archives//html/Amps/2017-01/msg00207.html (6,996 bytes)
- 4. [Amps] Alpha 9500 Relays Needed (score: 1)
- Author: "David B. Ritchie" <dbritchie@gmail.com>
- Date: Wed, 22 Nov 2017 17:02:39 -0800
- Anybody have any Gigavac G41C Alpha 9500 relays lying around for sale? Probably need one - would buy 2 new ones. David W6DR David B. Ritchie, Esq. T: 650-862-6400 E: dbritchie@gmail.com _____________
- /archives//html/Amps/2017-11/msg00192.html (6,883 bytes)
- 5. Re: [Amps] Amps Digest, Vol 212, Issue 1 (score: 1)
- Author: <dbritchie@gmail.com>
- Date: Sat, 1 Aug 2020 09:40:15 -0700
- Hi Mike! Yes - in my experience that is about what you can expect from a used SB220/221. New tubes might help a bit on 10M. The power supply is pretty marginal. There are things you can do to help it
- /archives//html/Amps/2020-08/msg00003.html (6,695 bytes)
- 6. Re: [Amps] Looking for Alpha 87A expertise (David W6DR) (score: 1)
- Author: <dbritchie@gmail.com>
- Date: Mon, 15 Mar 2021 09:57:36 -0700
- I wouldn't say I am an expert on the Alpha 87A although I did own one and deal with issues inside it for several years. It was a good amp and its best feature was the quiet and reliable PIN diodes ma
- /archives//html/Amps/2021-03/msg00015.html (8,588 bytes)
- 7. Re: [Amps] Amps Digest, Vol 244, Issue 9 (score: 1)
- Author: <dbritchie@gmail.com>
- Date: Sat, 15 Apr 2023 11:43:10 -0700
- 1) Make sure you have the manual - I will refer mostly to Page 13 2) Power Off, unplugged, ALL cables disconnected - check continuity with a VOM between Center pin of J4 and J5 - if you have continui
- /archives//html/Amps/2023-04/msg00021.html (12,193 bytes)
- 8. Re: [Amps] Amps Digest, Vol 252, Issue 17 (score: 1)
- Author: "David B. Ritchie" <dbritchie@gmail.com>
- Date: Tue, 26 Dec 2023 09:47:40 -0800
- I had one of those. The capacitors are made of a sheet of Teflon between two sheets of aluminum. If you burn thru the Teflon under a high SWR condition (which can happen at 100W) then you can have pr
- /archives//html/Amps/2023-12/msg00042.html (9,664 bytes)
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