The Amp Garage

bepone wrote: ↑Wed Mar 20, 2024 1:49 pm In case you need any PT i can search and find something - Norway is in europe (by trade if i remember), any EU shop should be good, and also my local winder can send it there.

Thanks! I'll PM you when we get to the end of this

Given that Classictone has now gone, you will have no trouble with Twin 100w or Bassman 50 w transformers from Hammond and you can order them from Mouser Those are cheaper yes, but the prices I got on the MMs are not that much more and are direct dropins without the need to drill new holes in the c...

@ynor For this shame and troubles and specially a waste a lot of extremenly expensive free time, you should receive new Dumblelator (-working-) for free from the manufacturer! I agree. I'll address that to the manufacturer if it turns out that it needs replacement parts and is not easily cured by s...

Does Mercury have a C-lator PT that fits inside the chassis, or would you have to convert to outside rear mount? I'm not sure. Will have to check that out. I think the next move will be to disconnect the secondary side of the PT and note the results. Then disconnect the PT completely, move it out o...

I have been corresponding with Nik, who btw is extremely helpful and service minded towards his customers. However we've progressed far beyond that correspondation in troubleshooting here. He can offer me a good deal on Mercury Magnetics. I'm having some troubles with the PT on my second hand OTS as...

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=...

bepone wrote: ↑Wed Mar 20, 2024 9:24 am see here back of the pots, one wire like this
https://www.sweetwater.com/insync/media ... -photo.jpg

Will try and report

martin manning wrote: ↑Wed Mar 20, 2024 10:16 am The power transformer is inside the chassis and fully enclosed (with end bells). As you can see, the small size places everything in very close proximity.

Can a faulty PT unit or a badly designed PT leak more flux than the best ones? Does the end bells have any part in this?

Need to make sure the pots make direct contact with chassis disregarding the ground wiring shown here?

This transformer looks like is making magnetic short turn with the chassis when lid closed, going to saturation and spreading the flux around. This can be check with the power consumption.. if is like this, preamp will start to draw more current when lid is closed, and start to vibrates. This PT i ...

. Double post...

Can I just check: Are you saying here that having the device main power switch set to off (I.e. primary PT loop is broken) you *still* get a hum, albeit lesser, that only stops when the IEC cord is removed? Can you please retest that, ensuring that the caps are discharged? Correct. But it is a diff...

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. The PT also ...

GAStan wrote: ↑Tue Mar 19, 2024 10:18 pm What are the chassis and lid made of? Are they both the same material?

Yes

aha mechanical vibratios also are causing humm.. i forget that before but also can be in your case! mechanical vibrations are shaking sensitive grids of input tube and making small voltage, like microphone, and you have permanent hum inserted via signal with vibrating! Weird thing is, when lid is o...