Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: hesamadman on January 06, 2014, 01:28:57 pm

Title: Correct way to convert tube rectifier to solid state?
Post by: hesamadman 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?

(http://i89.photobucket.com/albums/k205/fratbasher/rectifiertube.jpg) (http://s89.photobucket.com/user/fratbasher/media/rectifiertube.jpg.html)

converted to

(http://i89.photobucket.com/albums/k205/fratbasher/diode-1.jpg) (http://s89.photobucket.com/user/fratbasher/media/diode-1.jpg.html)

I have the 5v tap connected in photo….forgot to remove it.
Title: Re: Correct way to convert tube rectifier to solid state?
Post by: sluckey on January 06, 2014, 01:31:06 pm
that's right
Title: Re: Correct way to convert tube rectifier to solid state?
Post by: TIMBO on January 06, 2014, 01:34:51 pm
Man, Some of you guys really have a handle on your computer stuff  :cussing:
Title: Re: Correct way to convert tube rectifier to solid state?
Post by: hesamadman on January 06, 2014, 01:37:13 pm
Quote from: sluckey on January 06, 2014, 01:31:06 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:
Title: Re: Correct way to convert tube rectifier to solid state?
Post by: hesamadman on January 06, 2014, 01:38:32 pm
Quote from: TIMBO on January 06, 2014, 01:34:51 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:
Title: Re: Correct way to convert tube rectifier to solid state?
Post by: HotBluePlates 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.
Title: Re: Correct way to convert tube rectifier to solid state?
Post by: eleventeen on January 06, 2014, 02:17:40 pm
Why is the lower 5 volt connection remaining in place?
Title: Re: Correct way to convert tube rectifier to solid state?
Post by: hesamadman on January 06, 2014, 03:16:25 pm
Quote from: eleventeen on January 06, 2014, 02:17:40 pm
Why is the lower 5 volt connection remaining in place?

Ill kill it….. Forgot to remove it from schematic :)
Title: Re: Correct way to convert tube rectifier to solid state?
Post by: kagliostro 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