Silver face Bassman to 6G6-B Bassman

[crbowman]

I believe it's a 350k tapped pot. You can replicate it's function with a 500k pot like so: https://tubeamparchive.com/viewtopic.ph ... 334#193334

Yep, sorry.

[alvarezh]

If don't want to go the way Martin pointed you, here it is off the shelf:

http://store.marshamps.com/product_info ... cts_id=378

Ready to mount!

Cheers!

[loicdulux]

I know I'm going to cause cringes, but I converted my AA864 Bassman to Blonde several years ago. I played it that way until I converted it back when I sold it. I know Blackfaces are supposed to be great, but I loved the Blonde so much more. It did everything the Black did, but did it better. I didn't use the bass channel, so I converted it to a parallel guitar channel and bridged them via the unused "Deep" switch. Glorious.

Hi BTF, hey, that sounds awesome. Would you think it's feasible on the bass channel only of a 74' SF (AA371)? Would like to clean the guitar (clean soooo clean) channel for jazz or using pedals.


True that these SF bassman are good to start mod: that's my first one and there is so much space inside, quite easy to understand what is where!

[BTF]

Sorry to answer so late. Hardly anyone ever acknowledges me here so I only infrequently check the posts!

Here's what I did to the bass channel after I converted back: I wired the first input stage as a 12AX7 paralleled with a 47K plate resistor on the paralleled plates, grids wired together to the bass channel input jacks, and the cathodes paralleled on a resistor 820 ohms with a 250uF bypass cap. Then that went into a standard Fender tonestack, but with the .1 and .047 changed to .022uF and .022uF and the 250pF disc changed to a 250pF silver mica with 100K slope resistor (Ken Fischer's Fender tone stack mod). Then that went to a 1M volume pot to a standard 100K plate, 1500 ohm, 25uF bypass following stage. It sounded wonderful for jazz or Clarence White country. Most people that tried both channels always cut the Bass Channel up and the Fender stock channel down!

Seriously, I can't recall a single person who ever preferred the stock channel. The Bass channel was big, warm and thick. You just plugged the guitar into the Bass channel, flipped the Deep switch up to bridge the channels, and adjusted both volumes to balance your sound. No fooling with or forgetting a bridging cable!

Sorry again to keep you waiting for a reply! Bill.

[loicdulux]

Hi Bill,

Interesting infos I need to digest. Many thanks!!

[Timvox1]

Well I Did IT!
It turned out great!
I bought the parts I needed for the conversion from Marsh amps and I used parts from the Silver face Bassman including the transformers and the amp sounds fantastic.
I have owned and still own some really nice amps including 1965 Vox AC 30, Vox AC 15, Fender Deluxe and various Marshall amps and I've got to say this one is turning out to be my all-time favorite amp.
I've long been a fan of my 65 AC 30 and my Tremolux was a great amp but this Bassman just might top all of them.
All my guitars and effects pedals sound great through this amp.
It has a great clean sound up to about 3 1/2 and at 6 and above the distortion kicks in and kicks ass and is tighter than any of my Marshall amps.
The amp has tons of bass and lots of clean chime.
My Fender bass guitar sound deep and thick through the Fender 2 15 cabinet but I still prefer it for guitar.
Now I know why this amp was a favorite of George Harrison and Brian Seltzer.

[dobbhill]

Congrats!...and now you know why I won't get rid of mine....
D