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Hoffman Amps Forum image Author Topic: TOS REBUILD ALMOST DONE  (Read 2309 times)

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Offline TIMBO

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TOS REBUILD ALMOST DONE
« on: December 08, 2011, 01:16:50 am »
Hi guys, I'm nearing the completion my TOS and it is with out doubt a fantastic amp ( the buzz has not gone completely but i think the volume level i'll will be playing the amp at, i can live with it ). Tubenit removed the original master vol and replaced it with the "chime control" ( i've called it "CRUNCH")and i was thinking of putting in another pot for a "volume" pot as the volume pot off pin7 V1 acts more like a GAIN control ( i was unaware that this amp when cranked had some pretty big NUTS and really SMOOTH/WICKED distortion ).I did notice that when in CLEAN mode the buzz is a lot louder than when in overdrive, why this is i don't know as one would think if the buzz is loud in clean then it would be worse when in overdrive  :dontknow:, The overdrive is great as it is and when the PPIMV is set there is plenty of adjustment with the OD controls  :blob10: so i was wanting to be able to set the PPIMV and have more control of the VOL in the clean section.The original had a LEVEL pot that was switched out when switched to OD but now that the CHIME has been added where would the best place be for the NEW VOL pot  :think1:

Tubenit, I tried the "enhance cap" (250p silver mica)across the 82k plate resistor on the PI but it sounded terrible and distorted the sound but not in a good way, i also tried some other values, no good. Thanks
« Last Edit: December 08, 2011, 02:29:33 am by TIMBO »

Offline tubenit

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Re: TOS REBUILD ALMOST DONE
« Reply #1 on: December 08, 2011, 04:29:35 am »
Quote
where would the best place be for the NEW VOL pot 


Just put it like this which is similar to the original. 

Thanks for the review of the "enhance" cap. I am very surprised to hear that it "distorted" the sound & I am wondering if that is because of the buzz problem?

With respect, Tubenit

 


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