Silvertone 1482 Fuse Troubleshooter help - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Instruments and Amps Everything that makes music, Especially including instrument amps.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 28th October 2012, 06:51 PM   #1
diyAudio Member
 
Join Date: Oct 2012
Default Silvertone 1482 Fuse Troubleshooter help

Hi, this is my first post after lots of lurking and googling, and I'm still a tube rookie, but I could use a little good advice to save a lot of solder.

I got a Silvertone 1482 in mint condition from a friend. I was even more of a rookie at the time, and plugged it into the wall and powered it up after sitting in an attic for 40 yrs, instead of using a variac

So it worked fine for about 15 minutes then the fuse blows. I replaced the fuse again and it blew after about 10 minutes again.

So then I started reading and googling

I pulled out all the tubes, turned it on, it will sit with power for a long time. Then added rectifier, then preamp, then power tubes.

Currently it will run fine with either power tube (6V6) but not with both. If I have it powered and both tubes installed the fuse blows after some minutes.

What is your advice for my first replacement? My instinct is power tubes, but they each seem to work ok alone... what else should I consider?

Thanks for your patience w/ a beginner
  Reply With Quote
Old 28th October 2012, 08:36 PM   #2
diyAudio Member
 
Join Date: Dec 2010
Location: Nottingham, NH
If you have and can wield a multimeter it will be easier to help you. Also does it have original caps and valves etc?

i actually have the same amp on the bench right now that is in need of some tlc.

Last edited by famousmockingbird; 28th October 2012 at 08:43 PM.
  Reply With Quote
Old 28th October 2012, 10:31 PM   #3
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Electrolytic caps are aluminum cans full of slime, sealed with rubber. the rubber deteriorates from the oxygen in the air, sitting or running. More when they are running. Many people find old consumer electronics run fine at the resale shop, then blow 4-80 hours later as the water evaporates out past the cracked rubber seal.
I don't measure electrolytic capacitors, except with a calender, YY<1992 is a potential problem.
Measure all metal below the chassis <25 VDC before you touch it. Don't use more than one hand, use a clip lead on the negative. For details on how to replace can caps cheaply with radial lead caps, which can be rated at hours life of 10000, see this thread Vintage Magnavox tube amp
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
  Reply With Quote
Old 28th October 2012, 11:20 PM   #4
diyAudio Member
 
Join Date: Oct 2012
Quote:
Originally Posted by famousmockingbird View Post
If you have and can wield a multimeter it will be easier to help you. Also does it have original caps and valves etc?

i actually have the same amp on the bench right now that is in need of some tlc.
Yes I have one. I'm good w/ electrical stuff and some electronics, tube amplification is a frontier for me

What should I test?

Everything is stock, like a time machine, just a little attic dust, now clean.
  Reply With Quote
Old 30th October 2012, 07:33 PM   #5
diyAudio Member
 
Join Date: Dec 2010
Location: Nottingham, NH
Well the old 6v6's could be about dead and pulling excessive current and popping the fuse. I would stick a known good pair of 6v6's in and if the fuse doesn't pop measure from one of the 6v6's pin 8 to ground, it should read around 15v.

I agree with the above statement about replacing the electrolytics in that amp. There are only 4 I think.
  Reply With Quote
Old 5th November 2012, 01:57 AM   #6
diyAudio Member
 
Join Date: Oct 2012
Thanks for the help so far. I've got new caps on order from Newark, newish ("tested") 6V6's on order off the 'bay. There's this funky cap in it (like a multi-tap transformer) that has three values, 20/10/5 uf /450v. I ordered a 22uf, a 10uf, and a 4.7uf. << the lower capacitance: is that OK? or will it cause trouble? I could have gotten the Sprague spec'd at 5, for the price of the rest of the order

The others were easy to find matches for.

So here's to waiting on the UPS man to bring me my goodies... what can brown do for you?
  Reply With Quote
Old 5th November 2012, 02:57 AM   #7
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Those cap values are fine. Are the new caps also rated 450V,I hope?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Silvertone 1482(x2) project jhooper Instruments and Amps 0 17th March 2012 10:04 PM
Fuse housing melting but fuse not blowing, ppi amp rawadia Car Audio 21 2nd August 2008 10:39 AM
Silvertone 1482 Blowing Rectifier Tubes Toyman_PA Instruments and Amps 1 4th August 2007 04:06 PM
amp rating for fuse and fuse holder? riotubes Parts 5 27th August 2006 03:10 AM
Transitional SIlvertoneAmp between 1472 and 1482? Gunny Tubes / Valves 0 1st February 2006 04:51 AM


New To Site? Need Help?

All times are GMT. The time now is 04:12 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki