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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 28th October 2017, 09:40 PM   #11
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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Looking at your chosen transformer, 330 0 330 will give you around 500volts so maybe a change of value for R5 to drop the voltage to a useable level.
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Old 28th October 2017, 10:10 PM   #12
Mark Fugate is offline Mark Fugate
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What if I use 330 0 260?

I must add that I appreciate your patience and willingness to help.
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Old 28th October 2017, 11:41 PM   #13
colnago55 is offline colnago55  United States
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I think you wiring is wrong. I'm using the same transformer for my 300B.

On mine the two brown wires are in the 7 & 8 slots and the brown and white in the six slot.

Otherwise I believe we match up.

good luck.
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Old 29th October 2017, 12:26 AM   #14
Mark Fugate is offline Mark Fugate
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Thanks guys!
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Old 29th October 2017, 04:57 PM   #15
Mark Fugate is offline Mark Fugate
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Gentlemen,

I just changed my transformer secondary to 260-0-260 and I now have B+ = 414 Volts and B- = -195.

I also changed the filament wiring as suggested by calnago55.

I still do not think that I am out of the woods because all other forum posts I find for 300B TSE use the 330-0-330 windings.
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Old 29th October 2017, 05:49 PM   #16
Mark Fugate is offline Mark Fugate
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I 'think', (KEYWORD 'Think') things may be working since making the transformer change.

It puzzles me that I can not find anyone else using the secondary windings that I am using.

Any thoughts, comments, and ideas are greatly appreciated.
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Old 30th October 2017, 06:54 PM   #17
mkane77g is offline mkane77g  United States
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TSE 300B Initial checkout problems.  Help please.
voltage checks don't lie
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Old 30th October 2017, 07:06 PM   #18
colnago55 is offline colnago55  United States
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I am using the 330 taps on the same transformer and my B+ is around 360. My 5842's are set at 175.

I'm using a choke and a motor run capacitor.

What is your set up?
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Old 1st November 2017, 04:36 PM   #19
Mark Fugate is offline Mark Fugate
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mkane77g - you are absolutely correct! I neglected to check my variac output and as you have guessed, the variac output was 141 volts.

Color a deep and very bright shade of 'stupid'.

Thanks again guys
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