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Old 5th February 2012, 05:40 PM   #491
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1.25V across 2.7R is .046A. I believe the pronblem may lie in the fact that i am powering both fiaments from on regulator.
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Old 5th February 2012, 06:04 PM   #492
Salas is offline Salas  Greece
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One on one and on nominal Ih. Don't string them in series with a CCS, they will auto arrange and give problems.
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Old 5th February 2012, 06:07 PM   #493
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Fixing problem now! There no reason i cant use same supply with different regs, correct.
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Old 5th February 2012, 06:29 PM   #494
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Hi Salas,

Is it possible to add links to the latest schematics of the circuits in post #1? That will make it easier to get started.

Thanks!!
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Old 5th February 2012, 06:40 PM   #495
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Check post #1, is it OK?
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Old 5th February 2012, 08:22 PM   #496
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So, with filament not hooked up, I set the SSHV2 voltage to 340 as stated on the schematic. When the filament heaters are hooked up, it drops to 300. Is this correct? i tried adjusting up with filament heaters attached and it wouldnt move. Checked again with filaments unhooked and it read over 350. Also, with secondary of trafo wire in series, using seperate regulators, i get one filament dropping 6.1V and the other dropping 5.7V. not eaxactly matched. Is this a result of sharing a secondary or mismatch of tubes?
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Old 5th February 2012, 08:29 PM   #497
Salas is offline Salas  Greece
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No, its not correct, you probably need more CCS current.
For the heaters it looks more like tolerances in Ih, 317internal Vref, resistor's %. Parallel the resistor in the 5.7V one with 100R to see what happens, if it gains, find one that will give you 6.1V. That Vh is good for longer life than 6.3V also.
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Old 5th February 2012, 09:18 PM   #498
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Is the B+ drop with filaments hooked up problem as well. Completely rebuilt filament supply. Will do the same for SSHV2 this week.
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Old 5th February 2012, 09:59 PM   #499
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Try more ccs current in the reg first. If the tubes are drawing 45ma set at 65mA.
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Old 6th February 2012, 12:53 AM   #500
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Sorry, misunderstood that you were addressing both problems in previous post. I am only running a single SSHV2, perhaps with second one in operation, things may change without need for adjustment. Feel pretty comfortable with what is going on now, so i should be able to work it out.
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