ReginaldBisquet
Member
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- 2,317
A friend of mine brought over his dead Fender Deville 2x12. He said the amp no longer powers up... not even the bulb lights up. He loved this amp and wants it repaired, but his budget is $200.
After doing some trouble shooting, I narrowed the issue down to the thermister (also called an inrush limiter) located at TH-1. I also noticed that two capacitors (C40 and C41) were very wobbly.... like a loose teeth. Other than that, the board looks good. Even still has the original grid resisters which (I am told) burn out quickly.
Question: anyone out there experience a bad thermister on these amps?
Also - his master volume knob is busted... it it keeps spinning round and round. Probably from stripped while getting beat up on the road.
And while I have it open - I was thinking of changing out some caps and resistors as per DIYGuitarist.com's recommendations.
So here's what I have on the shopping list:
Watts Tube Audio
C23 1.5uf --> .022/400v (SOZO)
C26 0.1uf --> .047uf/630v (Mallory 150)
C27 same as above
R12 130k --> 82k/1 watt
C40 1000uf/35 volt --> same (Sprague)
C41 1000uf/35 volt --> same (Sprague)
R61 1 watt/470 ohm --> 3 watt / 470 ohm (metal oxide)
R62 same as above
Darren Riley
R26 Master Volume (Fender Part # 0037600) 100K B (Darren highly recommended NOT installing an audio pot)
TH1 10 ohm / 4 amp C60-11
Tube stabilizer foamy thing (he lost his long ago)
Antique Electronic Supply
TAD 12AX7 (x3)
TAD 6L6 WGC (x2)
After doing some trouble shooting, I narrowed the issue down to the thermister (also called an inrush limiter) located at TH-1. I also noticed that two capacitors (C40 and C41) were very wobbly.... like a loose teeth. Other than that, the board looks good. Even still has the original grid resisters which (I am told) burn out quickly.
Question: anyone out there experience a bad thermister on these amps?
Also - his master volume knob is busted... it it keeps spinning round and round. Probably from stripped while getting beat up on the road.
And while I have it open - I was thinking of changing out some caps and resistors as per DIYGuitarist.com's recommendations.
So here's what I have on the shopping list:
Watts Tube Audio
C23 1.5uf --> .022/400v (SOZO)
C26 0.1uf --> .047uf/630v (Mallory 150)
C27 same as above
R12 130k --> 82k/1 watt
C40 1000uf/35 volt --> same (Sprague)
C41 1000uf/35 volt --> same (Sprague)
R61 1 watt/470 ohm --> 3 watt / 470 ohm (metal oxide)
R62 same as above
Darren Riley
R26 Master Volume (Fender Part # 0037600) 100K B (Darren highly recommended NOT installing an audio pot)
TH1 10 ohm / 4 amp C60-11
Tube stabilizer foamy thing (he lost his long ago)
Antique Electronic Supply
TAD 12AX7 (x3)
TAD 6L6 WGC (x2)
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