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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Alpha\s+91b\s+problem\s*$/: 19 ]

Total 19 documents matching your query.

1. [Amps] Alpha 91b problem (score: 1)
Author: "Terry Baxter" <w6cbureau@san.rr.com>
Date: Sun, 20 Nov 2022 00:38:56 +0000
All, Recently I wrote about a problem I had with my Alpha 91b. It popped the rear panel fuse F3 (2 amp). The problem turned out to be a bad power transformer. In my case the secondary winding for the
/archives//html/Amps/2022-11/msg00029.html (7,989 bytes)

2. Re: [Amps] Alpha 91b problem (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sun, 20 Nov 2022 14:42:16 +0800
Yes. I have a shot transformer from a 91B here. Similar problems to yours. The owner bit the bullet several years ago and bought the Hammond replacement transformer and the hv/screen supply board. Th
/archives//html/Amps/2022-11/msg00030.html (8,674 bytes)

3. Re: [Amps] Alpha 91b problem (score: 1)
Author: Charlie Young <weeksmgr@hotmail.com>
Date: Sun, 20 Nov 2022 16:04:49 +0000
I have a defective Alpha 91 transformer in my junk pile. WD8CCCs amp started blowing primary fuses probably 8 to 10 years ago now. The problem was an internal winding to winding short. The transforme
/archives//html/Amps/2022-11/msg00031.html (13,035 bytes)

4. Re: [Amps] Alpha 91b problem (score: 1)
Author: K9FD <merv.k9fd@gmail.com>
Date: Sun, 20 Nov 2022 10:34:09 -0600
I have a 91B that has the exact same symptoms,  and it appears its the transformer. So you can add another to the list.   Also have a 99 and it has just went south, hoping its a shorted tube and not
/archives//html/Amps/2022-11/msg00032.html (13,089 bytes)

5. Re: [Amps] Alpha 91b problem (score: 1)
Author: "Terry Baxter" <w6cbureau@san.rr.com>
Date: Sun, 20 Nov 2022 17:54:36 +0000
Another much cheaper alternative is to just use a separate bias or screen supply depending on which one has failed. However since my transformer has a 4.6k ohm short from the 105 V winding to the HV
/archives//html/Amps/2022-11/msg00033.html (14,439 bytes)

6. Re: [Amps] Alpha 91b problem (score: 1)
Author: gudguyham--- via Amps <amps@contesting.com>
Date: Sun, 20 Nov 2022 18:26:40 +0000 (UTC)
I thought I heard that Acom might have replacement transformers for the 91b/99 amps. After all Acom built them.  Its very possible that the new Acom 2000a transformer can be retrofitted into the 91b
/archives//html/Amps/2022-11/msg00034.html (15,903 bytes)

7. Re: [Amps] Alpha 91b problem (score: 1)
Author: bmm57 <bmm57@sbcglobal.net>
Date: Sun, 20 Nov 2022 12:51:04 -0600
Acom does not build a transformer replacement for alpha 91b or 99, Hamilton is the only one who has a replacement right nowFor $1000.00 plus shipping. I have replaced over 20 Transformers in these 2
/archives//html/Amps/2022-11/msg00035.html (15,498 bytes)

8. Re: [Amps] Alpha 91b problem (score: 1)
Author: gudguyham--- via Amps <amps@contesting.com>
Date: Sun, 20 Nov 2022 19:14:27 +0000 (UTC)
Terry, Im not sure about floating that winding but its very possible that if your HV winding is good you might be able to abandon that other winding.   Heres what I do know.  The famous Heathkit SB10
/archives//html/Amps/2022-11/msg00036.html (16,637 bytes)

9. Re: [Amps] Alpha 91b problem (score: 1)
Author: Rodrigo <ct1bxt@gmail.com>
Date: Sun, 20 Nov 2022 19:24:05 +0000
Hi, I solve a problem on ACOM 1500 witch had a leek between hi voltage and filament that blow fuses as soon as I connect the ground to chassis . The solution was a new transformer, 600 euro !!! This
/archives//html/Amps/2022-11/msg00037.html (31,896 bytes)

10. Re: [Amps] Alpha 91b problem (score: 1)
Author: Ron W4BIN <ka4inm@gmail.com>
Date: Sun, 20 Nov 2022 17:10:28 -0500
Another much cheaper alternative is to just use a separate bias or screen supply depending on which one has failed. However since my transformer has a 4.6k ohm short from the 105 V winding to the HV
/archives//html/Amps/2022-11/msg00038.html (8,324 bytes)

11. Re: [Amps] Alpha 91b problem (score: 1)
Author: Donald Fox via Amps <amps@contesting.com>
Date: Sun, 20 Nov 2022 23:39:48 +0000 (UTC)
Gents: A motor rewind shop saved my bacon back in '09-'10. I had an ECA 1214 plate xformer from a Henry 3K Classic Mark II, that was arcing on the outermost winding to the frame/core. For $200, the c
/archives//html/Amps/2022-11/msg00039.html (9,491 bytes)

12. Re: [Amps] Alpha 91b problem (score: 1)
Author: Jim W7RY <jimw7ry@gmail.com>
Date: Sun, 20 Nov 2022 15:36:08 -0600
Remember that Heybour transformers does great work too. I've had great luck from their HV transformers. 73 Jim W7RY The owner bit the bullet several years ago and bought the Hammond replacement trans
/archives//html/Amps/2022-11/msg00040.html (11,401 bytes)

13. Re: [Amps] Alpha 91b problem (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 20 Nov 2022 19:29:58 -0600
The reason Hammond is the only source is that they purchased the PW Dahl plans for ham transformers from Jeff K8CQ. He bought the IP from Dahl, not the rest of the business when Peter went SK. For a
/archives//html/Amps/2022-11/msg00041.html (8,779 bytes)

14. Re: [Amps] Alpha 91b problem (score: 1)
Author: gudguyham--- via Amps <amps@contesting.com>
Date: Mon, 21 Nov 2022 02:33:29 +0000 (UTC)
Rob, the TenTec 425 also had trouble with shorted transformers.  I must have replaced at least 4 transformers in the 425 power supplies.  If the customer was a SSB and casual CW kind of guy I would r
/archives//html/Amps/2022-11/msg00042.html (9,545 bytes)

15. Re: [Amps] Alpha 91b problem (score: 1)
Author: Kimo Chun <kimochun@gmail.com>
Date: Sun, 20 Nov 2022 17:17:15 -1000
Back in 2014, I asked EPD, Inc., in North Carolina to make me a transformer for my 91b. I contacted Hammond but they didnt seem ready to do it. Perhaps just my impression. Another 2 hams also wanted
/archives//html/Amps/2022-11/msg00043.html (10,052 bytes)

16. Re: [Amps] Alpha 91b problem (score: 1)
Author: Ken Claerbout <kenk4zw@gmail.com>
Date: Mon, 21 Nov 2022 07:58:52 -0500
"I tested all the bad 425 transformers and each one faulted the exact same way. At least they were consistent." Same here. I have two bad transformers from K3ZO's amps if anyone is looking for a boat
/archives//html/Amps/2022-11/msg00044.html (11,014 bytes)

17. Re: [Amps] Alpha 91b problem (score: 1)
Author: gudguyham--- via Amps <amps@contesting.com>
Date: Mon, 21 Nov 2022 13:22:19 +0000 (UTC)
Ken, they primaries would short if I remember  Sent from the all new AOL app for iOS "I tested all the bad 425 transformers and each one faulted the exact same way.  At least they were consistent." S
/archives//html/Amps/2022-11/msg00045.html (11,565 bytes)

18. Re: [Amps] Alpha 91b problem (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 21 Nov 2022 04:33:01 -0600
Yes EPD is a good outfit, I agree. Ten Tec made their own iron to save money because they were cheap. They had a guy on the payroll who did nothing but make their transformers but then he quit and we
/archives//html/Amps/2022-11/msg00046.html (8,937 bytes)

19. Re: [Amps] Alpha 91b problem (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 22 Nov 2022 07:09:03 +0800
Likewise here Rob. For my friend's amp, before he decided to bite the bullet and buy a new transformer, I had two toroidal transformers custom wound. Each had a HV winding and the the other voltages
/archives//html/Amps/2022-11/msg00047.html (10,334 bytes)

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