Quote:
Originally Posted by bhegges
I am looking at building an all tube television and have some questions about the high voltage supply. In looking at some of the early designs a 1b3 diode was used in conjunction with a beam pentode oscillator. My understanding is that the beam pentode would feed a high frequency into the primary transformer winding and thus creating the high voltage secondary to feed the 1b3. I am thinking of using an oscilloscope tube and will probably need 2-6kv depending on the tube.
My question: could I use a low frequency (60hz) high voltage transformer that are commonly used in ion fan generators, etc? My concern would be that there would be a high ripple voltage due to the low frequency.
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If you want to do a 60 cycle supply use a 2X2 or 2V3 as the rectifier, filter with a couple of .05uF to .1uF HV caps at 1.5-2X times your output voltage. This design was used for virtually every pre-war TV with a "brute-force" HV supply.
I have a transformer sitting here, 2.5KV,
[email protected],
[email protected] all the voltages you need for the HV section of your project. This transformer will work for a 2X2 not enough filament current for the 2V3
$25 plus shipping. Contact me off list if your interested.
Chuck