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Hoffman Amps Forum image Author Topic: Parts not in Doug's catalog  (Read 825 times)

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Offline GuitarPilot65

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Parts not in Doug's catalog
« on: May 13, 2025, 12:28:12 pm »
Please provide recommendation for where to purchase:
  • 2-watt/1-ohm resisters for Fender bias test points
  • Ceramic 47pF/1kv capacitor (Fender Vibroberb "Bright" channel)
« Last Edit: May 13, 2025, 12:35:56 pm by GuitarPilot65 »
1993 Brown Fender '63 Vibroverb RI (6G16)
1994 Blonde Fender '65 Deluxe Reverb RI (AB763, modified [by me])

Offline tubeswell

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Re: Parts not in Doug's catalog
« Reply #1 on: May 13, 2025, 02:50:56 pm »
Mouser
A bus stops at a bus station. A train stops at a train station. On my desk, I have a work station.

Offline Willabe

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Re: Parts not in Doug's catalog
« Reply #2 on: May 13, 2025, 05:07:14 pm »
.... 2-watt/1-ohm resisters for Fender bias test points.

1/2w is plenty, you don't need 2w. It's only 1 ohm and very little current is going through.

Offline EL34

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Re: Parts not in Doug's catalog
« Reply #3 on: May 14, 2025, 06:31:12 am »
1/2 watt 1 ohm is watt is used for bias and I stock those here
Resistors-3

I stock 47p/500v caps also here
Capacitors-4

Why do you think you need 2 watt and 1000 volts

Offline HotBluePlates

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Re: Parts not in Doug's catalog
« Reply #4 on: May 18, 2025, 10:41:33 am »
I stock 47p/500v caps also here
Capacitors-4

Why do you think you need ... 1000 volts

On other forums, builders have noted so many recurring problems with "500v silver mica" caps leaking DC even when brand-new, even when applied voltage is well below 500v, that they have switched to using 1kV mica caps for pF values in things like Fender amps.

I have no idea whether this is like JJ octal tubes from 10-15 years ago (which had the too-skinny pins that would lose contact with Pin 5 and go into meltdown), and is a problem that has since been resolved.  But those builders were burned enough times by having to troubleshoot new builds & replace the same 500v silver mica caps that they use only 1kV micas or simply skip to ceramic caps.

Offline EL34

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Re: Parts not in Doug's catalog
« Reply #5 on: May 18, 2025, 12:17:33 pm »
Well, I have ceramic 500p 1kv caps on the page above also
FYI, Been selling those same caps for 25+ years
This is the first time I have heard of anyone having an issue with the caps I sell

 


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