Mystery Resistor across 6l6gc

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WORMDIRT
Posts: 63
Joined: Tue Feb 25, 2014 5:18 am

Mystery Resistor across 6l6gc

Post by WORMDIRT »

I'm doing a tune up on a red bear mk60, and at some point someone put a 100ohm resistor across the heaters (Pin 7/2) then to ground on one of the power tube sockets.. Any idea what this was trying to achieve? It was strange enough for me to believe it was some sort of mod that I'm not aware of.
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TUBEDUDE
Posts: 1864
Joined: Thu Jan 04, 2007 5:23 pm
Location: Mastersville

Re: Mystery Resistor across 6l6gc

Post by TUBEDUDE »

A goofy attempt.to give the heaters a.ground reference?
Tube junkie that aspires to become a tri-state bidirectional buss driver.
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BLT
Posts: 110
Joined: Mon Jun 03, 2013 9:20 am
Location: Washington

Re: Mystery Resistor across 6l6gc

Post by BLT »

Bad attempt to create an artificial center tap?
BLT
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Leo_Gnardo
Posts: 2585
Joined: Thu Sep 27, 2012 1:33 pm
Location: Dogpatch-on-Hudson

Re: Mystery Resistor across 6l6gc

Post by Leo_Gnardo »

At least they didn't run the 100 ohm R from chassis to pin 7 then the rest of the lead to pin 2. One of my crustomers who tries to build kits (and can't follow directions) did this. Luckily filament current was only run to pin 2. Brought his prize in wondering why it sounded weak and had a lot of hum. :shock:
down technical blind alleys . . .
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