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    New capacitor for tight spaces and a quesion

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    sailor

    Posts : 269
    Join date : 2011-04-04

    New capacitor for tight spaces and a quesion

    Post by sailor on Tue Nov 22, 2011 11:18 am

    While researching parts at Mouser I stumbled across a new style of electrolytic capacitor from Nichicon. [A pencil capacitor.]The 82mfd/450 volts is 2" long but is a little less than a half inch wide. They will fit where no other 82MFD cap will, In the lower chassis of the SCA and probably the ST 35 amps. They might also fit in the PAS preamp.
    My question: Does anyone see a problem piggy backing these caps to the quad cap. Say, in the case of the SCA and ST, one extra cap on each of the 3 high voltage sections? That would over double the capacitance of the amps and be a very easy mod to do?

    Bob Latino
    Admin

    Posts : 2415
    Join date : 2008-11-26
    Location : Massachusetts

    Re: New capacitor for tight spaces and a quesion

    Post by Bob Latino on Tue Nov 22, 2011 1:22 pm

    Hi,

    There is no reason why you couldn't do as you suggest - BUT - I am not sure that the extra caps would help the amp. The key section of the quad cap in the SCA-35 is the section which has a SQUARE symbol. This is the quad cap section that powers the two output transformers. Adding extra capacitance here *could* help the amp to play with more ease at higher volume levels. With the other sections (IMHO) adding capacitance would not cause the amp to play any better.

    Bob

    sailor

    Posts : 269
    Join date : 2011-04-04

    Re: New capacitor for tight spaces and a quesion

    Post by sailor on Tue Nov 22, 2011 9:30 pm

    Thanks Bob I'll try it and see what happens.

    PeterCapo

    Posts : 386
    Join date : 2008-12-05

    Re: New capacitor for tight spaces and a quesion

    Post by PeterCapo on Wed Nov 23, 2011 11:59 am

    Bob,

    Can you explain about the low ESL characteristic of your amps' power supplies? Perhaps this is something sailor can include.

    What is it that you put in, Bob, a small polypropylene cap in parallel?

    Thanks.
    Peter

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