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K200 B5 Reverb tank question [message #29114]

Sat, 16 September 2023 21:59

oldjim
Messages: 2
Registered: July 2020

Junior Member

I'm working on a K200B PA head (serial No 56053) for a friend. He has owned the amp for fifty years and it's never been serviced. Originally was in a bar until his uncle gave it to him. It has a Gibbs reverb tank that only has one spring but looks like it is configured for two springs. The Gibbs input and output both measure 186-186 ohms and both are grounded. After cleaning connectors there is a little reverb with the pot full on. I tried an Accutronics tank I have - 4FB2C1B - and after I grounded the input the reverb was a little better. Questions: Everything I have read says the original tank configuration is not available - true? What is an acceptable signal lever on the tank output transformer with reverb full on at full volume? Do you see any problem using the Accutronics tank as a permanent solution? Thank you all for the help.

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Re: K200 B5 Reverb tank question [message #29115 is a reply to message #29114]

Sun, 17 September 2023 06:50

stevem
Messages: 4778
Registered: June 2004
Location: NY

Senior Member

Hi.

It's good that both the input and output transducers do not test open on the original tank as you have found.
If you pm me I will explain to you how to take parts from the new tank and get the old more valuable original tank working again.

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