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Hoffman Amps Forum image Author Topic: Correct way to convert tube rectifier to solid state?  (Read 6462 times)

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Offline hesamadman

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Correct way to convert tube rectifier to solid state?
« on: January 06, 2014, 01:28:57 pm »
Im converting the gretsch 6151 from tube to solid state rectification and was curious if I have this right?



converted to



I have the 5v tap connected in photo….forgot to remove it.

Offline sluckey

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Re: Correct way to convert tube rectifier to solid state?
« Reply #1 on: January 06, 2014, 01:31:06 pm »
that's right
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline TIMBO

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Re: Correct way to convert tube rectifier to solid state?
« Reply #2 on: January 06, 2014, 01:34:51 pm »
Man, Some of you guys really have a handle on your computer stuff  :cussing:

Offline hesamadman

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Re: Correct way to convert tube rectifier to solid state?
« Reply #3 on: January 06, 2014, 01:37:13 pm »
that's right

You sick of me yet? ha Thanks for your help. Im still a beginner here. Learning everything I know from this site.  :icon_biggrin:

Offline hesamadman

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Re: Correct way to convert tube rectifier to solid state?
« Reply #4 on: January 06, 2014, 01:38:32 pm »
Man, Some of you guys really have a handle on your computer stuff  :cussing:

I had a lot of training in many areas (websites, photoshop, YUCK) before I found what I truly loved…….wiring houses!!!  :icon_biggrin:

Offline HotBluePlates

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Re: Correct way to convert tube rectifier to solid state?
« Reply #5 on: January 06, 2014, 01:53:15 pm »
If your unloaded B+ is not near/at 500vdc, you don't need 2 diodes in series for each leg. 1N4007's are rated for 1kV.

The unloaded voltage will be the PT a.c. * 1.414, and the diode will have twice that across it when it tuns off. So a P voltage of 500 * 0.7071 = 353vac or less only needs a single 1N4007 per leg. If you want extra as a safety margin, cool. Just know it isn't necessary.

Offline eleventeen

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Re: Correct way to convert tube rectifier to solid state?
« Reply #6 on: January 06, 2014, 02:17:40 pm »
Why is the lower 5 volt connection remaining in place?

Offline hesamadman

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Re: Correct way to convert tube rectifier to solid state?
« Reply #7 on: January 06, 2014, 03:16:25 pm »
Why is the lower 5 volt connection remaining in place?

Ill kill it….. Forgot to remove it from schematic :)

Offline kagliostro

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Re: Correct way to convert tube rectifier to solid state?
« Reply #8 on: January 06, 2014, 05:24:26 pm »
I'll add a big W not very high ohm resistor (10-15W begin with a 100-150R) as to compensate the resistance of the tube

or you'll have a higher B+ voltage on the node

K
« Last Edit: January 06, 2014, 06:25:21 pm by kagliostro »
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