I’ve got an 86 in for repair now and it had loads of problems wit pin diodes in
the past. Finally someone put in the Alpha vacuum relay board that was made to
do away with the pin diodes.
Sent from the all new AOL app for iOS
On Tuesday, November 8, 2022, 4:52 PM, Paul Christensen <w9ac@arrl.net> wrote:
ETO's documentation of the Alpha 86 is sketchy at best. The amp went through
several re-designs during its production lifecycle, most changes of which are
related to QSK performance and PIN diode protection. The last design iteration
added new circuit boards directly behind the front panel.
From what I can determine, the 86 laid the groundwork for its successor, the
model 89. Only a couple hundred 86 models were produced by ETO before changing
to the more robust model 89 design. I own an early 86 with no design updates.
Paul, W9AC
-----Original Message-----
From: Amps <amps-bounces@contesting.com> On Behalf Of gudguyham--- via Amps
Sent: Tuesday, November 8, 2022 4:31 PM
To: David Tenenbaum <dmt013@gmail.com>
Cc: amps@contesting.com
Subject: Re: [Amps] Alpha 86
It’s odd that it works on 120 and not 240. I looked in the manual but the
terminal strip is not numbered on the schematic.
Sent from the all new AOL app for iOS
On Tuesday, November 8, 2022, 3:24 PM, David Tenenbaum <dmt013@gmail.com> wrote:
Thanks for the feedback!
I am still on the clock at work but took a break to check R8 and I am seeing
3.98K ohms, so the 4k resistor seems intact. Later tonight when finally done
with work I will tear into it to look at the fuses and other resistors, confirm
there is REALLY 220 v getting to the unit, and anything else that comes up.
Thanks all for the ideas!!!!
David N1RO/VE3TMK
On Nov 8, 2022, at 2:33 PM, gudguyham@aol.com wrote:
Did you check R8 for open?
Sent from the all new AOL app for iOS
On Tuesday, November 8, 2022, 2:20 PM, David Tenenbaum <dmt013@gmail.com> wrote:
Hi All,
I have an Alpha 86 that I have been using set up for 110v, and finally have
access to 220v, so looking forward to seeing what it can REALLY put out.
Unfortunately I have made the jumper changes (terminal in the back for 110
operation has locations 1&2 jumpered, 3&4 jumpered, and 5&6 jumpered, but for
220 only locations 2&3 are jumpered), and the unit fails to light up or come
online. I hear a single relay activation when I hit the "On" switch, but no
lights or fan.
Fearing I hurt the unit I restored it to 110v operation and all is good. I set
it back to 220v and same problem. I checked continuity from the plug's ground
to chassis ground, and the hot leads show continuity to the right places. I
have been using a 220v SB200 on that outlet just fine.
Any thoughts or leads appreciated! Never thought I would have a problem just
switching supply voltages.....Scan of schematic attached....
Best,
David
N1RO/VE3TMK
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|