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Post subject: Early 70s Bassman 100
Posted: Thu Sep 14, 2017 2:44 pm
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Bought one last weekend and it is the best sounding amp I have ever owned!

However, being a bit greedy and using for a guitar amp am wondering if anyone knows of mod to get it to a Twin Reverb without the reverb?

Any thoughts or suggestions will be mucho appreciated.

Here is a link to the quad 6L6 Beastman:

https://www.bing.com/images/search?view=detailV2&ccid=%2fHeGshSg&id=2FCD2CDD833006FF2F2DB8459F8FD3BCE8887825&thid=OIP._HeGshSgzC1ACm0a3Vk0nAEsCM&q=fender+bassman+100+layout&simid=607996538530302222&selectedIndex=1&qpvt=fender+bassman+100+layout&ajaxhist=0

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"I'm still searching even today for a sound, like the guy that's searching for a home. I haven't been able to find that completely. I'm satisfied at times with the sound of my guitar ... But if I ever get it, I'll know." BB King


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Post subject: Re: Early 70s Bassman 100
Posted: Thu Sep 14, 2017 6:11 pm
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Prolly need to play with front end, pre-amp coupling caps a bit. They to compare the setup of this amp's 12AX7 sections with Super Reverb or other guitar amp front ends. That would be my starting point.

May also need some mods to phase inverter stage.


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Post subject: Re: Early 70s Bassman 100
Posted: Mon Sep 18, 2017 5:14 pm
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The normal channel looks similar to the twin preamp.
The thing that throws me is the addition of coupling caps off the treble wipers.
Why use a .0047 in the bass channel? .047 in the normal ch?
The rest looks similar to a Twin.


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