An open 220k bleeder resistor makes sense. I guess you could check that by
disconnecting it and checking the resistance. Makes me wonder what would cause
it to fail. Assuming 250 volts it would need to dissipate 0.28 watt. If it's a
1/2 watt carbon composition resistor, it might have increased
Ken Winterling [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Tom,
There is a 220K bleeder/load resistor, R8, across the medium B+, 250V,
supply to ground. If it is open the medium B+ will be pulled up
toward the
Ken Winterling [EMAIL PROTECTED] made an utterance to the drakelist gang
--
According to Tom this supply also had an open 10K HV bleeder/load
resistor. Whatever caused it to fail may have caused the 220K
resistor to fail. I'm
Subject: Re: [drakelist] AC-4R upgrades
Donnie Garrett [EMAIL PROTECTED] made an utterance to the drakelist
gang
--
Tom:
I have one of the early AC3 supplies that used a HV choke. Garey
K4OAH and I had a lot of discussions about
in daily use. You wisely chose to use it on the test bench instead.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Donnie Garrett
Sent: Tuesday, December 12, 2006 5:27 AM
To: Tom Taylor
Cc: drakelist@www.zerobeat.net
Subject: Re: [drakelist] AC-4R upgrades
Hey, thanks for the tip! I just checked the vertical ceramic load resistor
and it is open, just like yours. Last night I decided to just replace all
the electrolytic capacitors under the chassis (and the diodes as well).
Before clipping out the old parts, I took voltage measurements so I'd have a
, December 12, 2006 5:27 AM
To: Tom Taylor
Cc: drakelist@www.zerobeat.net
Subject: Re: [drakelist] AC-4R upgrades
Donnie Garrett [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Tom:
I have one of the early AC3 supplies
Garrett
Sent: Tuesday, December 12, 2006 5:27 AM
To: Tom Taylor
Cc: drakelist@www.zerobeat.net
Subject: Re: [drakelist] AC-4R upgrades
Donnie Garrett [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Tom:
I have one
Donnie Garrett [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Tom:
I have one of the early AC3 supplies that used a HV choke. Garey
K4OAH and I had a lot of discussions about its design some time back
after I
: drakelist@www.zerobeat.net
Subject: Re: [drakelist] AC-4R upgrades
Donnie Garrett [EMAIL PROTECTED] made an utterance to the
drakelist gang
--
Tom:
I have one of the early AC3 supplies that used a HV choke. Garey
K4OAH and I had
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang
--
Tom -
Yeah, that's typical. You're taking the right approach, since a failure
in the Bias supply can take out more than just the finals, even if the
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