Thanks Steve and Chris for your helpful advice regarding a possible bad
crystal. I think you are right but somehow, despite being most careful, I seem
to have made matters worse! Are 45 year old crystals particularly delicate?
Should I renew them all?
Tried the 15m crystal in
- Original Message -
From: Damien Mannix damienman...@hotmail.com
To: drakelist@zerobeat.net
Sent: Saturday, September 01, 2012 9:54 AM
Subject: Re: [Drakelist] Exploding cap? Further progress?!
Thanks Steve and Chris for your helpful advice regarding a
possible bad
Hi all, It is time I gave all you kind folks a progress report. Found the
WB4IQK AC3/4 troubleshooting guide invaluable. Tested all voltages with the
covers off, very carefully! All okay. As promised by the seller I found that
the two caps and four diodes in the 650v circuit have been
, August 27, 2012 11:33 AM
To: drakelist@zerobeat.net
Subject: [Drakelist] Exploding cap? Progress
Hi all,
It is time I gave all you kind folks a progress report.
Found the WB4IQK AC3/4 troubleshooting guide invaluable. Tested all voltages
with the covers off, very carefully! All okay
Hello all, I am embarrassed but most grateful for all the kindness and helpful
advice given to me. Too many to thank individually but many many thanks to
all. The safety advice is taken very seriously and I will be ultra cautious
bearing in mind my inexperience. Already I am puzzled.
- Original Message -
From: Damien Mannix damienman...@hotmail.com
To: drakelist@zerobeat.net
Sent: Saturday, August 25, 2012 8:36 AM
Subject: [Drakelist] Exploding Cap' ???
Hello all, I am embarrassed but most grateful for all the
kindness and helpful advice given to me. Too
Sounds like an arc over and there is usually some trace of carbon but
it can be hard to identify at times.
Another possibility is a cracked ceramic bleeder resistor. I am not
familiar with the AC-4 but my L7 power supply uses large ceramic
resistors and I had one develop a crack that was not
Hi all, Bought an immaculate looking TR4 which has been out of use a long time.
Also bought an AC4 which claims to have had the original EHT caps and diodes
replaced. Powered them up with 20 vac for four hours, then up in 20 v steps at
four hours per step, listening and sniffing for any
-boun...@zerobeat.net]
On Behalf Of Damien Mannix
Sent: Thursday, August 23, 2012 12:24 PM
To: drakelist@zerobeat.net
Subject: [Drakelist] Exploding cap' ???
Hi all,
Bought an immaculate looking TR4 which has been out of use a long time.
Also bought an AC4 which claims to have had the original
On 8/23/2012 1224, Damien Mannix wrote:
Hi all,
Bought an immaculate looking TR4 which has been out of use a long
time. Also bought an AC4 which claims to have had the original EHT
caps and diodes replaced.
Powered them up with 20 vac for four hours, then up in 20 v steps at
four hours
I forgot to mention I was present when one within my Drake L7 went. Filled
the basement with little tiny things that looked a lot like tiny black
butterflies fluttering to the floor. I don't remember if diodes went or not.
But it did repair easily enough.
Ed Tanton
website:
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