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#1
12-14-2010, 02:12 PM
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HR Deville Thermistor
Anyone ever change a current inrush limiter, a/k/a thermistor on one of these? I've got one that went open after a strange excursion.
One of the power tubes shorted out and the two 100 ohm resistors on the filament string cooked themselves. After repairing the board and replacing the resistors I went to power it up and no joy. It did have a 20A fuse in the socket  So out that went and I put a fuse in the B+ string sort of as insurance. The AC would disappear at the thermistor but bridging it everything's fine. I did find the part number at Mouser, 527-CL60-5A. It is a 5 amp 10 ohm thermistor. 
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#2
12-14-2010, 02:49 PM
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As long as the amp works by bridging it,then get the new part and put it in.It's cheap insurance instead of replacing the power transformer.
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#3
12-14-2010, 04:57 PM
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Quote:
 That CL60 should work fine, a lot of guys use those in McIntosh MC240 power amps and they hold up great.
__________________
Univox U1511 150W Seymour Duncan 100W convertable DIY Monster Champ SE 807,Richter 5E3 1973 Marshall Lead 100W/restored Restored McIntosh MC240
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#4
12-14-2010, 05:07 PM
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Think a musician WOULDN'T use that nail to finish a set?
"Gee,my amp melted on stage and it was fine a minute ago"."right before I jammed that nail in the fuse holder"
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#5
12-14-2010, 05:12 PM
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Really. I guess the thermistor ended up being the fuse of last resort.
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#6
12-14-2010, 05:25 PM
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Seems like 20 amp fuses are everywhere.I just fixed a silverface super that had a 20 amp fuse.The rectifier tube shorted out and it blew the internal fuse thermo-fuse near the PT.Lucky it was there.
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#7
12-14-2010, 07:42 PM
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Gosh...I'm not sure I'm following this. Can I leave the nail in my amp, or do I have to get a 20A fuse? Your help appreciated...sort of.
__________________
Mike "Yes...I was having a cup of tea with Mr. Roccoco here, when suddenly this madman burst through the door. Honking wildly, at the last possible second, he stopped on a dime. Unfortunately, the dime was in Mr. Roccoco's pocket..." . Good Deals here.
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#8
12-14-2010, 09:56 PM
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Quote:
haha That IS what happened to my first Ampeg SVT, Went up in a blaze of glory during a practice. Ah to be young and dumb  Back then we called it clever though
__________________
Univox U1511 150W Seymour Duncan 100W convertable DIY Monster Champ SE 807,Richter 5E3 1973 Marshall Lead 100W/restored Restored McIntosh MC240
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#9
12-15-2010, 03:02 PM
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Quote:
__________________
I do repair work for a music electronics retailer, electronic design engineering for other clients, and occasionally manufacture custom electronics, including guitar amps.
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#10
12-15-2010, 03:44 PM
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Smart guy eh? Not too many guitar amps have 20 amp fuses.
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