HELP! V3 pins 1 & 6 voltage almost double!!!

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drshewhart
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HELP! V3 pins 1 & 6 voltage almost double!!!

Post by drshewhart » Mon May 02, 2011 11:18 am

This is my first topic! Been reading a lot of time though. Now I need your help.

I'm finishing the first 50w plexi clone, with Magnetic Corp. trannys, Sozo caps and master volume mod. Quite standard for the rest.

Everything set, startup with voltage readings. Everything seemed to be ok, a bit higher than instructions -guess it's the difference in tension here in Spain (237v AC)-. But when reached V3, pins 1 and 6 read 380 & 388 volts, instead of 200 & 208 volts. The same in pins 1 & 6 of V1 and V2 are around 172volts instead of 148v.

Double checked everything but it seems to be right. Any ideas of what's up there?

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Mars Hall
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Re: HELP! V3 pins 1 & 6 voltage almost double!!!

Post by Mars Hall » Wed May 04, 2011 6:28 am

Is that with or without tubes? I believe you'll get higher than normal readings without tubes installed.
"You just slide a bottle up and down til what you want out of it comes out. You just slide away at it til you've got it down." Duane Allman

drshewhart
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Re: HELP! V3 pins 1 & 6 voltage almost double!!!

Post by drshewhart » Thu May 05, 2011 9:31 am

Yes, all tubes in.
I'm thinking maybe it's a shortcircuit in any electrolytic?

robert
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Re: HELP! V3 pins 1 & 6 voltage almost double!!!

Post by robert » Thu May 05, 2011 12:29 pm

Hi,

measure/ check the 470 Ohm resistor. Often one confuses (colorwise) this value with 470K!
And measure the continuity of the pi tailresistor to ground also.

In general: check all your ground connections for continuity.

Regards

Robert

drshewhart
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Re: HELP! V3 pins 1 & 6 voltage almost double!!!

Post by drshewhart » Thu May 05, 2011 5:47 pm

I was right when i said there's great people in this forum.
Thanks Robert, you dig it!!! One 470 ohm resistor confused. Everything perfect right now, and it sounds..... simply WOWH!!

Thanks again!!

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