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Re: [Amps] Alpha 86

To: David Tenenbaum <>
Subject: Re: [Amps] Alpha 86
From: gudguyham--- via Amps <>
Reply-to: "" <>
Date: Tue, 8 Nov 2022 21:31:21 +0000 (UTC)
List-post: <>
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.

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On Tuesday, November 8, 2022, 3:24 PM, David Tenenbaum <> 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!!!!

On Nov 8, 2022, at 2:33 PM, wrote:
Did you check R8 for open?

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On Tuesday, November 8, 2022, 2:20 PM, David Tenenbaum <> 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....


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