Author Topic: How long does a '74 Model T hold a charge after unplugging it?  (Read 2474 times)

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Offline Colossus76

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just wondering. i need to clean it up and i don't want to get killed.

Offline Colossus76

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Re: How long does a '74 Model T hold a charge after unplugging it?
« Reply #1 on: March 10, 2009, 11:31:48 pm »
damn, nobody??

Offline Oli

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Re: How long does a '74 Model T hold a charge after unplugging it?
« Reply #2 on: March 11, 2009, 01:47:22 am »
Hi,

it takes 5 tau to get it discharged....well, better use a resistor, here is a rule of thump:

R (Ohm) x C (Farad)= ½ dischagetime

A 10 or 20 Ohm resistor can do the job.  Check the rest voltage!!! Have a look at wikipedia for the schematics aswell! Be shure that you disconnected the amp!

Please be very careful what you are doing! If I where you I would better visit a tech and watch what he is doing!

Greetings

Oli

SUNN Sorado - 1969 / SUNN 2000S - 1970 / SUNN Sorado  - 1971 / SUNN 350B - 1973 / SUNN Coliseum 880 - 1973 / SUNN Concert Bass - 1972 / SUNN Concert Bass - 1979 / 2x SUNN 215B - 1970/75 / SUNN/SAD 2000S cab

Offline noel

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Re: How long does a '74 Model T hold a charge after unplugging it?
« Reply #3 on: March 11, 2009, 07:04:36 am »
I'm not sure I see the issue here.  I assume by "clean the amp" you just wanna clean up the chassis/cabinet etc.  So you're thinking about taking the amp out of the cabinet naturally.  If that's right I wouldn't get too worried because the amp does not hold a charge as such, its the capacitors in the amp that hold a charge.  The way you're gonna die with a tube amp is by bridging a filter cap.  If you just wanna do some external cleaning go ahead but just stay away from the stuff inside the amp.