Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: gman4q2 on July 24, 2021, 11:55:58 am

Title: Broken Traynor YBA-1 volume pot
Post by: gman4q2 on July 24, 2021, 11:55:58 am

I have an old YBA-1 Bassmaster and the channel 1 volume pot seems to be broken inside the pot, (turns with no effort/ resistance). I am going to replace it but have been reading where everyone is replacing the 500k linear with 1m audio, however I haven't found any explanation as to the reason (or benefits) for this change. My pot reads 470k lin.

So, why do it?

Thanks.

Title: Re: Broken Traynor YBA-1 volume pot
Post by: sluckey on July 24, 2021, 12:09:22 pm

Audio taper pots are more user ear friendly when used for a volume pot. I would use a 500K-A pot but 1M-A will work just as well.

Title: Re: Broken Traynor YBA-1 volume pot
Post by: Latole on July 24, 2021, 02:12:30 pm

I have a YBA-1 at home and volume pots are 400K A.
Follow Sluckey advice.

Pots :

https://hoffmanamps.com/MyStore/perlshop.cgi?ACTION=enter&template&thispage=PotsKnobs&ORDER_ID=!ORDERID!

Title: Re: Broken Traynor YBA-1 volume pot
Post by: thetragichero on July 24, 2021, 08:03:46 pm

yba1 went through a number of circuit changes. many of em came with 4MA volume pots. 500kA 1MA whatever you've got handy

Title: Re: Broken Traynor YBA-1 volume pot
Post by: Latole on July 25, 2021, 02:51:31 am

Quote from: thetragichero on July 24, 2021, 08:03:46 pm

yba1 went through a number of circuit changes. many of em came with 4MA volume pots. 500kA 1MA whatever you've got handy

Right !

Title: Re: Broken Traynor YBA-1 volume pot
Post by: gman4q2 on July 27, 2021, 11:49:42 am

Thanks for the replies. I replaced it with a CTS 500k.

Title: Re: Broken Traynor YBA-1 volume pot
Post by: Latole on July 27, 2021, 12:19:30 pm

Quote from: gman4q2 on July 27, 2021, 11:49:42 am

Thanks for the replies. I replaced it with a CTS 500k.

500K A