Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Leevi on November 08, 2021, 12:50:30 pm

Title: Carvin V3 mod
Post by: Leevi on November 08, 2021, 12:50:30 pm

I have Carvin V3 on my desk and I'm wondering the caps that have been added from power amp plates to B+.


/Leevi

Title: Re: Carvin V3 mod
Post by: sluckey on November 08, 2021, 01:03:06 pm

Maybe someone thought the amp was too bright or they were experiencing hi freq buzzes or oscillation. What value are the caps?

Title: Re: Carvin V3 mod
Post by: Leevi on November 08, 2021, 01:42:33 pm

They are probably Tantalum caps labeled with 471K, 470pF?


/Leevi

Title: Re: Carvin V3 mod
Post by: Latole on November 08, 2021, 03:26:50 pm

Quote from: Leevi on November 08, 2021, 01:42:33 pm

They are probably Tantalum caps labeled with 471K, 470pF?


/Leevi

471K = 470pf

Title: Re: Carvin V3 mod
Post by: sluckey on November 08, 2021, 04:40:55 pm

Quote from: Leevi on November 08, 2021, 01:42:33 pm

They are probably Tantalum caps labeled with 471K, 470pF?

Value seems probable but I doubt they are tantalum. Tantalum is usually 1µF and larger but in low voltage ratings.

Title: Re: Carvin V3 mod
Post by: Leevi on November 08, 2021, 10:05:27 pm

Quote

Value seems probable but I doubt they are tantalum. Tantalum is usually 1µF and larger but in low voltage ratings.

Might be some other type as well but I ended up to Tantalum because of their high voltage rating (3kV) and look.
See the picture.
/Leevi

Title: Re: Carvin V3 mod
Post by: thetragichero on November 08, 2021, 10:10:01 pm

dipped ceramic. 3kV probably prudent
https://www.tubesandmore.com/products/capacitor-3000v-ceramic-disc-10

Title: Re: Carvin V3 mod
Post by: Leevi on November 08, 2021, 10:23:12 pm

You are right 👍 Thanks
/Leevi