The Amp Garage

timrobertson100 wrote: ↑Tue Dec 17, 2024 7:05 pm What did you do with your mid switch please? I’ve tried various things people have suggested but never been satisfied.

I found that putting a 1uF cap over the 270 ohm resistor in the phase inverter works great and is like other mid/accent switches seen in early amps

C5 is not there to eliminate highs at the input. It is there to block RF from entering the amps circuit by creating an ac ground to chassis directly at the input. You see these caps in amps that have isolated input jacks / star ground to chassis. That's what I suspected the purpose was. I edited th...

C5 is not there to eliminate highs at the input. It is there to block RF from entering the amps circuit by creating an ac ground to chassis directly at the input. You see these caps in amps that have isolated input jacks / star ground to chassis.

For me personaly no F&T's. I don't like the sound of etched foil electrolytic caps in the power supply. I mostly use Mundorf and sometimes others with smooth foil.
They are a little bigger in size though.

Good to hear you found the problem. I don't really understand why Nik has changed things and put the transformer inside the chassis. But he is a very helpful guy so i'm sure it will be solved.

I have the exact same Ceriatone C'lator with five differences: 1. The transformer is outside the chassis. 2. All metal parts are have reference ground to chassis (pots, switches etc.) 3. High quality shielded cable.(Both inside the unit and to connect the unit to an amp) 4. Two chassis grounds. (1= ...

The chassis and lid are made of steel. This could explain vibrations. Especially when it lays lose on top of the chassis.

The transformer in the enclosure was probably not the best idea Nik had. I dont understand it either because it looks like the exact same PT, except the bell cover.

I was looking at the transformer mains and high voltage wiring. Could you take a picture of the side of the transformer where the wires are connected? The reason i ask this is that it looks like the high voltage and mains wiring are crossed. On my Ceriatone transformer mains connections are at the ...

I was looking at the transformer mains and high voltage wiring. Could you take a picture of the side of the transformer where the wires are connected?

I unscrewed the AC ground only from the chassis. Hum is still there. No change. Yes, I left the other two from the big caps still connected to ground. So lifting the AC ground did not help. Any other ideas? 1. Did you take the paint off the chassis for all connections to the chassis? (Solder lugs, ...

The groundwire of the two 33uF caps need to go to signalground.

https://www.reichelt.nl/nl/nl/jfet-s-c8417.html?r=1
Very suitable as audio input amp. Low noise, low bias, high transconductance

In my own amp i used this one:
https://www.reichelt.nl/nl/nl/transisto ... 1.html?r=1

If you are going to change the switches i can recommend using 11 position switches (blocked at 7 positions) like the original hand drawn schematic. This way you can make a common bus for the capacitors like the original schematic is drawn and as is visible on the gutshot of SSS001. (But if you measu...

I think it is best to wire the connector grounds together. I didn't see this in the video. The amp sounds nice!

Dit you put in the ground wires to the capacitor board?
Try to measure if you have 0 ohm between all the ground connections and chassis.