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Old November 24th, 2012, 11:49 AM   #1 (permalink)
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Silvertone 1482 hiss fix?

I have been fooling around with an old Silvertone 1482 - my first - good tubes connections et al - great tremelo - but constant hiss - with or without a guitar plugged in -

what needs changing?

I am careful - and ok with a soldering iron - but dumb about pieces and parts.

Thanks in advance to my tdpri brethren.

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Old November 24th, 2012, 12:20 PM   #2 (permalink)
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All those pieces and parts are wired rats nest style in the 1482...I have had about 4 and they all were not very quiet at idle. Silvertones had lots of cheap caps and resistors in there and not the best wiring scheme, these could cause some hiss. A 3 prong plug will help too.
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Old November 24th, 2012, 12:32 PM   #3 (permalink)
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Just for consideration.....
Tubes (especially V1)
Plate resistors (especially V1)
good luck
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Old November 24th, 2012, 01:00 PM   #4 (permalink)
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Tubes are good - installed the three prong -

plate resistors for V1?

Can you tell/show me more?
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Old November 24th, 2012, 02:02 PM   #5 (permalink)
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Wow, 330k in a 1482.?
Anyway.....
... see the 330k in the B+ rail. They go to each plate of V1. Change those to 1 watt carbon film and see what happens. You can also try knocking them down to 220k for less noise.
That would be Oranage, orange, yellow bands on the resistor.
best

http://www.webphix.com/schematic%20h...ertone1482.pdf
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Old November 24th, 2012, 03:52 PM   #6 (permalink)
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start by cleaning it. clean the jacks, the pots, the tube sockets. dust and corrosion are conductive. install shorting input jacks, can even consider isolated shorting jacks. tube shields are almost always missing on these and you can try that as well. might take a look at the shielding that should be applied to the side of the cab as well.
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Old November 24th, 2012, 04:09 PM   #7 (permalink)
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Quote:
Originally Posted by backline View Post
Wow, 330k in a 1482.?
Anyway.....
... see the 330k in the B+ rail. They go to each plate of V1. Change those to 1 watt carbon film and see what happens. You can also try knocking them down to 220k for less noise.
That would be Oranage, orange, yellow bands on the resistor.
best

http://www.webphix.com/schematic%20h...ertone1482.pdf
Quote:
Originally Posted by TheSmokingMan View Post
start by cleaning it. clean the jacks, the pots, the tube sockets. dust and corrosion are conductive. install shorting input jacks, can even consider isolated shorting jacks. tube shields are almost always missing on these and you can try that as well. might take a look at the shielding that should be applied to the side of the cab as well.
good and good - gives me stuff to consider and/or do.

Good schematic - working on deciphering it.

Its got shields and I did "some" cleaning but could do more
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