How would a few microwave oven transformers due for output transformers? They have a independence of 2200 ohms with a 8 ohm load. They could do as HV chokes also?
They work well as chokes. Not so as ouput iron. I thought one might do just what was wanted in a guitar amp...distort. Not even good enough for that application, the HF response is non existant.
Useless as an output transformer unless you want bass only. Made quite a reasonable (if heavy and bulky) plate choke in a 2a3 parafeed amp. Current limiting shunts are best removed first.
I have used them with success without removing the magnetic shunts (but I agree that you should) in a breadboarded 6080 (several in parallel) parafeed amp.
Why not just choke-input filter the MOT to get around 1700-1800VDC. Rectify with a couple TV damper diodes? You could probably run some big tubes in SE with that kind of power. Don't MOT's also have filament heaters?
p.s. please don't die.
p.s. please don't die.
You'll get about 2100V once rectified, at about 650mA.
But this is not a good idea, for a few reasons:
1. MOT are not rated to work continuously, they will not last too long.
2. Filament heater voltage for magnetrons is of about 3.3V@12A, not so useful for audio thermoionic valve (unless you double, rectify and regulate it).
3. MOT are prone to hum and to mechanical vibrations after a short time of life (they are not made for audio, but for kitchen ovens...).
4. I never seen a MOT in which you can remove the magnetic shunt; without removing it, however, the transformer is not so good.
5. One of the secondary end is directly connected to the MOT core, and thus the insulation of such an end is not so good with respect to ground, making it quite difficult to rectify the output voltage with a full bridge (you must keep the end connected to ground, and thus you can only rectify the voltage using an half wave with a single HV diode).
Ciao,
Giovanni
you could also cut the core apart and re-wind a new bobbin for it, to make it a choke or more manageable voltage.
Using MOT's as parafeed chokes in an RH807 amp - works well with no real downsides.
Also using one as a power supply choke, though at 500mA I'm not to certain if its working as a choke or as a big 100R resistor with good power disperation properties. I would guess theres probably just enough inductance left to take care of switching noise.
Shoog
Also using one as a power supply choke, though at 500mA I'm not to certain if its working as a choke or as a big 100R resistor with good power disperation properties. I would guess theres probably just enough inductance left to take care of switching noise.
Shoog