Fender 6G6 (A or B)

[C Moore]

Pardon my ignorance, but what is the 350k - 70k tap? It is noted on the treble pot of the Normal Channel.
Thank You

http://www.el34world.com/charts/Schemat ... N_6G6A.pdf

[M Fowler]

Hoffmanamps.com sells them:

350KA pot with tap point Used on some brown era fender amps
Four solder tabs

[C Moore]

Thanks Mark -
I am trying to figure out how these pots are wired. Please correct me.....
In the schematic, is the bass pot wired to lug #1, lug #2 wired to a cap going to ground, lug #3 is the wiper, and lug #4 is the other extreme of the pot that is wired to a .00025 cap ?
Thank You

[M Fowler]

That fourth lug off to the side is the tap which is wired to the wiper of the bass pot.

[C Moore]

So, that 70k tap, is that 70k relative to the wiper? Where does it go exactly?

[M Fowler]

This is how I see those pots wired using Hoffman's pot I posted earlier.

Excuse the poor drawing but I believe this is correct.

That is not a grouding lug in this case that represents the 70k tap.

Mark

[M Fowler]

Okay so this morning I did a google and found this data.

Marsh sells this pot.
Weber sells this pot.

First attachment is just use a 250k pot and add the resistor to the circuit.

[M Fowler]

https://tubeamparchive.com/viewtopic.ph ... 225742db6b

[C Moore]

https://tubeamparchive.com/viewtopic.ph ... 225742db6b

I was just reading this. Very interesting, I had no idea.....
Thanks Again Mark
I Appreciate It

[Roe]

update. tested a little. first, the 6g6b circuit with the 350k reduces treble. the effect is obvious when treble is turned down but it also reduces a little treble when treble is turned up fully (comparred to a disconnected 70k tap). also a 250k and a 68k resistor will hardly do since the pot reads 350k, not 250k. (350k gives more treble and mids than 250k)

[M Fowler]

If you built the circuit using a 250k it wouldn't really matter then, right?

Mark

[Roe]

If you built the circuit using a 250k it wouldn't really matter then, right?

Mark

there'll be a slight difference I think

[rawnster]

Here's a pic of an actual 1963 6G6-B clean channel tonestack. Notice how the treble/bass pot is wired. Although probably mechanically the same, there's a slight difference to what Mark's drawing shows earlier in this thread.

[wiredturtle]

you still up Rawnster? I just dropped the MM OT into the el sonido and the amp has turned into a real bassman. got a question text me.

ps. I recognize that amp

[wiredturtle]

oh