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Brook 12A Q
Brook 12A Q
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Old 11th March 2019, 03:36 AM   #11
ArcheusLedoux is offline ArcheusLedoux  United States
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Join Date: May 2015
Location: lexington KY
Brook 12A Q
Here's the circuit redrawn easier to look at.
I built this amp but made some changes in the front end.
The low capacitance had some LF attenuation.

Also here is a youtube video of a Brook 12A circuit modified to run a quad of 300B triodes.
My friend David Beard made the video. YouTube
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File Type: png Brook12-A - Copy.png (235.2 KB, 108 views)

Last edited by ArcheusLedoux; 11th March 2019 at 03:42 AM.
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Old 11th March 2019, 03:53 PM   #12
Palustris is offline Palustris  United States
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What did you use for the plate choke for the driver stage?
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Old 11th March 2019, 07:20 PM   #13
ArcheusLedoux is offline ArcheusLedoux  United States
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Brook 12A Q
Quote:
Originally Posted by Palustris View Post
What did you use for the plate choke for the driver stage?
I used a UTC MQM-300 choke 300HY @ 3700 ohms. Got it off Ebay. Also I have the LT Spice for this. Send me your email I can forward you a copy. Assuming you have Spice on your computer?

I have not tried these but these grid chokes may be an option. http://bit.ly/2HdLsLD

Also I know for a fact that Heyboer has made the Brook 12-A choke clone before. They run around 3600 to 3700 ohms.
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Old 13th March 2019, 04:01 PM   #14
Palustris is offline Palustris  United States
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Thanks, that's very helpful. No Spice, but thanks for the offer.
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Old 14th March 2019, 01:50 PM   #15
sunil is online now sunil  India
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I built a clone of the 12A in a single chassis. Any idea what is the gain of the amp ?
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