E
Engineer
- Jan 1, 1970
- 0
Hi, all...
This may seem an odd post but I'm an avid re-user and recycler of old
and/or scrapped electronic stuff (especially tube equipment), so I
hope all will be clear...
I have just picked over the carcass of a dead microwave oven (free
junk from a church sale) to get a thermal switch to repair our main
unit, but that's another story...
I pulled out all the usable bits (not many!) but also the power
transformer. It has a 1.75 x 1,25 inch core, weighs 9 1/4 lbs, and is
120 VAC to a scary 1,925 VAC (measured off load.) The core has two
magnetic shunts between the windings to give, I think, a degree of
voltage regulation (I may be able to press or knock them out, but I've
not tried yet.) The 120 volt primary resistance is about 0.3 ohm; the
2 KV secondary is 115 ohms.
Can anyone think of something useful to do with this this transformer.
All I can come up with is:
1. Use two of them back to back as a bench isolation transformer (but
watch the 2 KV floating around!)
2. Use as the OPT for a weird single-ended tube amplifier with 3.8
Kohm plate impedance (rather low) to a 15 ohm speaker (forget about 8
ohm speakers - too low; also need to isolate the secondary from the
frame (easy enough to do).)
3. Use it with a voltage doubler or tripler for an electrostatic
filter (would not fit inside most units so serious safety engineering
required.) Much too big, though.
4. Run it off a suitable battery and interrupter (NOT AC mains!) to
power an electric fence.
5. Use it as a choke in a tube power supply. I'm not sure of the
secondary winding inductance or current rating. Again, isolate the
secondary.
6. Use to replace another failed one <g> Do they ever fail?
That's it. Thanks for all ideas.
Cheers,
Roger
This may seem an odd post but I'm an avid re-user and recycler of old
and/or scrapped electronic stuff (especially tube equipment), so I
hope all will be clear...
I have just picked over the carcass of a dead microwave oven (free
junk from a church sale) to get a thermal switch to repair our main
unit, but that's another story...
I pulled out all the usable bits (not many!) but also the power
transformer. It has a 1.75 x 1,25 inch core, weighs 9 1/4 lbs, and is
120 VAC to a scary 1,925 VAC (measured off load.) The core has two
magnetic shunts between the windings to give, I think, a degree of
voltage regulation (I may be able to press or knock them out, but I've
not tried yet.) The 120 volt primary resistance is about 0.3 ohm; the
2 KV secondary is 115 ohms.
Can anyone think of something useful to do with this this transformer.
All I can come up with is:
1. Use two of them back to back as a bench isolation transformer (but
watch the 2 KV floating around!)
2. Use as the OPT for a weird single-ended tube amplifier with 3.8
Kohm plate impedance (rather low) to a 15 ohm speaker (forget about 8
ohm speakers - too low; also need to isolate the secondary from the
frame (easy enough to do).)
3. Use it with a voltage doubler or tripler for an electrostatic
filter (would not fit inside most units so serious safety engineering
required.) Much too big, though.
4. Run it off a suitable battery and interrupter (NOT AC mains!) to
power an electric fence.
5. Use it as a choke in a tube power supply. I'm not sure of the
secondary winding inductance or current rating. Again, isolate the
secondary.
6. Use to replace another failed one <g> Do they ever fail?
That's it. Thanks for all ideas.
Cheers,
Roger