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Starting a new 833 VTTC and want to use a regular transformer for the heater instead of a MOT like my 813 coil. MOT worked OK but not all that good looking and very heavy.
Any suggestions on where I might find a nice transformer? I have tried a few catalogs and ebay to no avail.
I want this coil to look spectacular so it needs to be a nice part.
In the parts gathering stage, going to take my time on this coil.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
You could try Surplus Sales Of Nebraska, they seem to have lots of transformers for tube equipment. I looked on their site and saw a couple of 10V filament transformers.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
If you are buying new, then HammondMFG has nice 10V, 10A transformers. Probably order through alliedelec or newark.
ADDED: Actually, you can use DC for filament voltage as well. In this case, an old PC power supply can probably be modified to give you the 10V, 10A you need.
Registered Member #505
Joined: Sun Nov 19 2006, 06:42PM
Location: Yorkshire!
Posts: 329
EastVoltResearch wrote ... ADDED: Actually, you can use DC for filament voltage as well. In this case, an old PC power supply can probably be modified to give you the 10V, 10A you need
* blows own trumpet *
You can just get away with removing the 5V feedback resistor and putting a pot in series with the feedback from the 12V, adjusting it to get your 10V.
Registered Member #593
Joined: Tue Mar 20 2007, 12:32AM
Location:
Posts: 50
Dan,
I tried to tell you this on the phone last night...but RF parts has the ideal socket for the 833 series triodes. It's ceramic, but unlike the 90 degree mounts made by RCA etc. it allows for vertical mounting of the tube, straight to the top of the chassis. Follow this link and scroll down to the SK13 socket:
It costs less than the ebay socket went for, and I'm pretty sure it's the same socket Chris Hooper used in his dual 833C (and quad) coils.
Now that we've gone from the filament transformer to the filament socket, we are beginning to stray off topic. You may want to start a project thread regarding your impending 833A vttc.
Registered Member #687
Joined: Mon May 07 2007, 02:21AM
Location:
Posts: 14
When I was building my dual 803 VTTC I had the same dilemma. I ended up using an old 12V transformer (I think its was removed from a UPS or a car battery charger) with a few of secondary turns removed. It was not very difficult to do, and I am pleased with the results.
I ended up using an old 12V transformer (I think its was removed from a UPS or a car battery charger) with a few of secondary turns removed. It was not very difficult to do, and I am pleased with the results.
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10V Filament Transformer for 833 dilemna
