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Old 8th December 2011, 05:13 PM   #1
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Default how to use PCL86 instead of ecl86

here is a circuit to use tubes like PCl86 82 PY82 88 on 6 volts heaters Google Vertaling
works really nice . although you might need to add a little series resistor . im seeing 17vdc from a 6vac winding drops to 15.5 on load ) you can get a higher output voltage by using low voltage drop diodes .

now there is no excuse not to use P tubes . you can serialize them . if you have odd voltages .

this circuit can be doubled whit more capacitors witch brings a cheap way of supplying HT to an amp project

have a good one suggestions are more than welcome

Last edited by v4lve lover; 8th December 2011 at 05:17 PM.
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Old 8th December 2011, 06:34 PM   #2
DF96 is offline DF96  England
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That is a simple voltage doubler. Will work fine, provided that people remember that it has a relatively high output impedance. To put it another way, it needs a low impedance secondary winding. The usual issue of DC vs RMS current means that trying to use, say, a 6.3V 2A winding to feed 16V at 0.6A could lead to disappointment.
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Old 8th December 2011, 06:40 PM   #3
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yup but if you have a beefy 4-5 amp winding and a a lot of capacitance i used 10,000 for my circuit it will refill very fast . between 50hz pulses . you might add a LM317 dissipating almost nothing but able to handle voltage transients quite well

its said to be very fast .
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Old 8th December 2011, 07:45 PM   #4
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i measured the ripple current on my scope it was 0.5v ripple . i reduced this to 20mV wich is more than adequate for heater supply by adding a salvaged choke from a PC PSU and a 10,000 cap . not bad
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