The Amp Garage

Where is this RD stamp? Any pics of this amp? IMG_6274.JPEG Here is another shot showing the tilt back leg. RD stamp.jpg The stamp is inside the chassis, near the power transformer. 462647415_1295747798128542_1390431063575250279_n.jpg I was advised to look for the stamp by the owner of this amp. Hi...

Thanks for the tip! The cabinet in question is original, so not looking to replace it. Since my original posting, I have located an "RD" stamp on the inside of the chassis which would indicate that this amplifier was "updated" by Fender in 1965. This explains the Black Face make-over and the 1965 CT...

I acquired a 1959 4x10 Bassman 25 years ago that had been updated with a black tolex theme, complete with tilt-back legs. I'm thinking that I would like to get it re-covered with an original looking tweed. Are there any recommendations for someone to restore the tweed on a vintage amp, in the U.S.? ...

martin manning wrote: ↑Sat Jun 08, 2024 12:25 am I would agree. It’s not feeding a grid where leakage would upset the bias point, and it’s not enough to alter the effective PI tail resistance. 15 uA at 300V is 20M parallel resistance.

Thanks that was pretty much my logic on both points.

I thought they were Mylar? My understanding was a loss of seal from the plastic case caused moisture ingress or something like that, but I'm just going on random things I've heard from the internet, so not too reliable... Yes, I have kept slightly leaky caps in the presence and tone cap positions t...

The presence cap doesn’t have much voltage across it, maybe 10V DC and 10 VAC on top of that. Granted lower voltage potential across the cap should result in less DC passing through, but my logic had more to do with the idea that leaking a bit of DC to ground here should not be a problem. Do you ha...

I have left these in without noticeable issues. I'm guessing there would be an audible change in performance if/when the cap degrades further, but I wouldn't worry too much about it. My understanding is the failures in yellow astrons are just as much from environmental issues and plastic degradatio...

During restoration of a Fender 5F6A Bassman I found the original Astron .1uf presence capacitor to leak 15uA DC @300V. Since the capacitor is part of an RC filter shunt to ground, I wouldn't expect there to be any ill effect from some DC leakage here. Thus, I am inclined to leave the original cap in...

Also, This is what else I'm dealing with....
I'm glad for the original board, but the amp is a basket case. The cab is also covered in ratty old black tolex... At least it still has the original iron, so someone needs to give it some love.

Right! Okay. Thanks for the replies. I think I got it now.
These are what I got. Measuring 31.6mm. I'm just going to roll with those, hoping they are within tolerance....

I am restoring an original 1959 4x10 Bassman (5F6-A). The amplifier does not have any control knobs, so they need to be replaced. I bought some off eBay that measure 1.25", but they look a little small in the bag. Can anyone confirm the correct length of the chicken head from the pointer-tip to tail...