Mallory FP 2x30/500 for Scott LX-72 - NOOB

Vespasian · 21st October 2006, 03:30 PM

I would really like to rebuild this amp and am trying to find sources for parts. I know that sometimes these old caps are ok but this one could fry eggs.
No luck yet finding this can cap, could someone provide a source or explain what my alternatives are? Thanks again for your patience!

Ed

Tom Bavis · 21st October 2006, 05:18 PM

1. Triode Electronics and AES (tubesandmore.com) have a 30/20/20 @ 525V for the ST-70 - parallel the two 20s and use it as a 30/40.

2. JJ makes dual can caps, but they require a mounting clamp, as they don't have the same mounting tabs.

3. Disconnect the can and replace with two 33 uF caps under the chassis.

Vespasian · 21st October 2006, 05:34 PM

If I need a 30/30, how do I make a 30/40 work?

Sounds like using two caps under the chassis is the way to go and probably the least expensive.

Thanks for the quick reply Tom.

Tom Bavis · 21st October 2006, 07:23 PM

30/40 is fine - values aren't critical, and were often specified as +80%/-20% for electrolytics. This part is expensive, but looks original. My choice would be the JJ 32/32 @ 525V - on sale for $7.95 at Antique Electronic Supply, needs a mounting clamp. I'm not sure if you can get two 33/500V caps for that...

Vespasian · 21st October 2006, 09:50 PM

Ok, I get it - thanks for the help Tom

21st October 2006, 03:30 PM	#1
Vespasian diyAudio Member Join Date: Sep 2006	Mallory FP 2x30/500 for Scott LX-72 - NOOB I would really like to rebuild this amp and am trying to find sources for parts. I know that sometimes these old caps are ok but this one could fry eggs. No luck yet finding this can cap, could someone provide a source or explain what my alternatives are? Thanks again for your patience! Ed

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21st October 2006, 05:18 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	1. Triode Electronics and AES (tubesandmore.com) have a 30/20/20 @ 525V for the ST-70 - parallel the two 20s and use it as a 30/40. 2. JJ makes dual can caps, but they require a mounting clamp, as they don't have the same mounting tabs. 3. Disconnect the can and replace with two 33 uF caps under the chassis.

21st October 2006, 05:34 PM	#3
Vespasian diyAudio Member Join Date: Sep 2006	If I need a 30/30, how do I make a 30/40 work? Sounds like using two caps under the chassis is the way to go and probably the least expensive. Thanks for the quick reply Tom.

21st October 2006, 07:23 PM	#4
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	30/40 is fine - values aren't critical, and were often specified as +80%/-20% for electrolytics. This part is expensive, but looks original. My choice would be the JJ 32/32 @ 525V - on sale for $7.95 at Antique Electronic Supply, needs a mounting clamp. I'm not sure if you can get two 33/500V caps for that...

21st October 2006, 09:50 PM	#5
Vespasian diyAudio Member Join Date: Sep 2006	Ok, I get it - thanks for the help Tom

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