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Post subject: This is a bassman 1965 AA165 OR AB165?
Posted: Mon Aug 01, 2016 7:06 am
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Hobbyist
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Joined: Tue Mar 17, 2015 8:25 am
Posts: 6
Hi
I have a bassman 1965, tube chart say AA165 but i know that is not very accurate.
I need know if is a AA165 or AB165.
I read that "AA165 have bias pot and ab165 hum balance pot" but not know how recognize "bias" or "balance" pot.
Here the pics
https://drive.google.com/file/d/0Bx_SS6jKtut8S0x1aEZrSHlYTTA/view?usp=sharing

https://drive.google.com/file/d/0Bx_SS6jKtut8WTA0Y2FGc0xlOWM/view?usp=sharing
https://drive.google.com/file/d/0Bx_SS6jKtut8SnFncng1anBmRlk/view?usp=sharing
https://drive.google.com/file/d/0Bx_SS6jKtut8SmtxQm5oWjlFNkE/view?usp=sharing
https://drive.google.com/file/d/0Bx_SS6jKtut8MWVLa1NxTkRkUEk/view?usp=sharing

A lot Thanks!!!!


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Post subject: Re: This is a bassman 1965 AA165 OR AB165?
Posted: Mon Aug 01, 2016 7:43 am
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Rock Star
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Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
https://drive.google.com/file/d/0Bx_SS6 ... sp=sharing

You have a balance (or hum) pot. AB165 circuit.

http://ampwares.com/schematics/bassman_ab165.pdf

The two 220k-ohm resistors sitting off the main board and attached to a terminal strip --- are part of the AB165 crazy local feedback applied to the 6L6GC tubes.

https://drive.google.com/file/d/0Bx_SS6 ... sp=sharing

Tone Lizard has a nice article on these BF and SF era Bassman circuits. And mods...

http://tone-lizard.com/bassman-mods/


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