The Amp Garage

WhopperPlate wrote: ↑Sun Apr 23, 2023 5:52 pm Easy enough to find out with a pair of alligator clips

Will definitely give it a try

I have been looking into different amps and noticed that the order of the pot (variable resistor) and the capacitor of the presence control change from amp to amp. For example, Borderline Special had the cap, followed by the pot which would be followed by the ground. 102 is the other way around, the...

Cool project!!

So I just measured, one lead at the metal base and one at Pin1.and I do get a reading of 0.2ohms. they are therefore probably connected

Thanks for the input. I will check later today with the meter and feedback here. Indeed super confusing Martin. I asked the guys I bought the tube from TubeWorld and they mentioned pin1 is connected to base...I guess I'd better test, but probably will rework the circuit to be on the safe side do tha...

It can be, but some brands may not make that connection. I’d just do a multimeter check to find out. Thanks Martin, Guy and Steve. I am planning on using a set of old GEs I had, a pair from 1969 and a pair from 1984. How can I measure this tubes with a meter? Red on PIN 1 and black to PIN 8? Set to...

I was checking some picture of AN version of this amp and I found intersting the tube wiring for 6550. He is floating the grid stopper instead of using PIN 1, and I always thought 6550 does not use PIN 1, similar to 6L6. The spec sheet of 6550 (attached) says that PIN 1 is base sleeve. He has two bl...

Super cool project CW, thanks for the additional details. Congratulations on the beautiful build. Are you going to be using it with a ODS?

Very nice!! Did you design those PCB boards? Which rack chassis did you use?

erwin_ve wrote: ↑Thu Apr 06, 2023 9:24 am The M stamp might be Panasonic. On their radial electrolytics is also a M stamp.
And they have a discontinued ECQ m series film cap.

Thanks for the input Erwin, I will surely do some research on Panasonic, many thanks.

67Plexi, looking forward to your reply

67plexi wrote: ↑Wed Apr 05, 2023 8:59 pm I have a few AE .1uf @ 630 volt

Will send you a DM

Here is the one with the A/E stamp, #167

Charlie Wilson wrote: ↑Wed Apr 05, 2023 7:32 pm Maybe this.
CW

Which caps are these Charlie, could well be

ITW seems to have the MF as well (attached)

I was looking into late 80's/ early 90's ODS and noticed that frequently HAD used those blue capacitors. I have been on a hunt trying to find out what they are. I have seen an early amp (maybe 18X serial - don't recall exactly) which had a A/E stamp on the blue caps at the PI. The one on the picture...

I have been increasingly curious if the 50Hz to 60Hz will have tonal impacts on my Bandmaster. :wink: 40:56 https://youtu.be/rNvOUmwPiUQ Yep! I was looking at Kikusui 500M, which is the smallest unit, but it costs over GBP 2K. Hard investment but I am close to pulling the trigger as soon as I have ...