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    Where to get 80-40-30-20 cap for ST70

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    Robert
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    Where to get 80-40-30-20 cap for ST70

    Post by Robert on Fri Mar 19, 2010 2:37 am

    Anyone have a current source for the can cap? All the links in the various listings here seem to point to places that list themas out of stock.
    Was thinking perhaps get 2 of eaual value that are rated at lower voltage and wire them in series, thus each would only see half the voltage - but of course that only yields half the capacitance (unlike resistors in series)...

    Other than $75 on e-bay
    altho there seem to be plenty of them listed.

    Thanks
    Robert

    cardinal634

    Posts : 2
    Join date : 2010-03-19

    Re: Where to get 80-40-30-20 cap for ST70

    Post by cardinal634 on Fri Mar 19, 2010 2:39 am

    Sorry, logged in as guest there, thought I had logged in after registering, must have missed a step.
    Robert

    Bob Latino
    Admin

    Posts : 2378
    Join date : 2008-11-26
    Location : Massachusetts

    Re: Where to get 80-40-30-20 cap for ST70

    Post by Bob Latino on Fri Mar 19, 2010 5:23 am

    Hi Robert,

    Dynakitparts sells the high quality German 80, 40, 30, 20 cap. It is rated at 550 volts which is about 100 volts higher than the ST-70 operates. It is the best quad cap you can use in the ST-70 and costs considerably less than the $75 Ebay cap. Kevin is presently out of stock on this cap but he told me that he will be getting some in probably next week. Give him a call and he will put one aside for you when they do come in. Check out the link below.

    Dynakitparts quad cap

    Bob

    cardinal634

    Posts : 2
    Join date : 2010-03-19

    cap can

    Post by cardinal634 on Fri Mar 19, 2010 9:36 am

    Thanks Bob, I sent an e-mail to Kevin asking to have one set aside.

    I bought an Dynakit ST70 on e-bay that looks pretty stock to me as the cans and caps underneath say Dyaco on them. Nice wiring work underneath too.

    After reading the forum here, am thinking I should probably replace a few parts, like the Can, the 2 caps under the output transformer that go to -35 (-65? don't have schematic in front of me), and the selenium rectifier with a diode so I am not surprised at some point with major failure.

    Also bought a few spare 7199s on e-bay. When I bought the amp, one channel had some hum that that I traced to the 7199. Put another one in, no hum at all now. Other tubes seem more available, so have not bought spares for them yet.

    Have used it for 3-4 hours on several weekends now, sounds very nice driving a pair of JBL L3t (bought new in 1985 or so). Source is a Philips CD player (have to look at the model), headphone jack with level control going right into the amp, plenty of volume available - when wife & son are not home!

    Replaced foam surround on one woofer, the other doesn't have holes in it (yet) but just a matter of time I think, will be replacing it one of these weekends.

    Robert

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