Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: plexi50 on March 10, 2011, 02:16:02 pm

Title: P600D Diodes
Post by: plexi50 on March 10, 2011, 02:16:02 pm

I have bad P600D rectifier diodes in a peavey mixer amp. Do i have to order these or can i use 1N4007's ?

I am looking for the data sheet now. Input voltage is about 50VAC. Amperage im not sure of

Wait ok i see the data now. 6 amp RMS Reverse voltage 140. Crap. :BangHead:

Title: Re: P600D Diodes
Post by: RicharD on March 10, 2011, 02:26:08 pm

>can i use 1N4007's

No.  that's a 6 amp device. 
http://www.vishay.com/docs/88692/p600a.pdf

Mouser has em for $0.59
http://www.mouser.com/ProductDetail/Vishay-Semiconductors/P600D-E3-54/?qs=sGAEpiMZZMutXGli8Ay4kODqjMEDWgQ30qk7cOhaXcY%3d

Title: Re: P600D Diodes
Post by: plexi50 on March 10, 2011, 02:39:32 pm

Thanks BL. I just ordered them from Newark. Man im running into a whole new field of parts working on SS stuff. Did i i say i hate SS. Actually it's sorta fun if you know where to look. If not RUN! I like those new icon things.  :cussing: :BangHead: :sad2: :worthy1: :dontknow: :l2:

Title: Re: P600D Diodes
Post by: RicharD on March 10, 2011, 02:46:21 pm

You know you're a tube-head when you've got over 200 parts drawers but only 1 is labeled transistors.

 :help:

Title: Re: P600D Diodes
Post by: Danskman on March 10, 2011, 02:46:54 pm

They are given for 6A (!). 1N4007 are 1A / 1000V. 1N5408 are 3A / 1000V.
I join the P600n series datasheet. I would replace them by the same type.
On your pic, it seems they "exploded". I would double-check the power supply to be sure there is no shorts below...
HTH,
Danskman

Title: Re: P600D Diodes
Post by: PRR on March 10, 2011, 02:53:27 pm

If 6A diodes are failing, and you don't find any downstream problem as Danskman says, then I would go to a 15A or 25A part. Even though this probably means extending the wires to a FWB module bolted to a bracket.

The peak currents in a large-cap power supply push the limits of rectifiers. What happened a LOT (before computer analysis) is that rectifiers would work fine on test-bench then fail after a few hundred start-ups. I used to get my beer money replacing rectifiers. Now that silicon prices are lower, _IF_ you don't want the beast to come back in a few years, you should generally up-rate your replacement.

Title: Re: P600D Diodes
Post by: plexi50 on March 10, 2011, 03:58:23 pm

Thanks all for the good info. The XR-600 was DOA when i got it for free. I have already replaced the PS 5000uf/55VDC caps and one 250 ohm resistor that was reading 380 ohms. All other resistors read within there specs. Look at these caps. They worked to the very end. Someone piggy backed 2500uf across the cap cans i suppose to make it last a little longer. They just should have replaced the cap cans and been done with it. It is an old toy (1977) but i think i can get it up and running again. So far i only have $45.00 invested. Those cap cans arent cheap