Dynaco 400 diod block ? - diyAudio
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Old 13th January 2003, 03:14 PM   #1
diyAudio Member
Join Date: Sep 2002
Location: B/R , La.
Lightbulb Dynaco 400 diod block ?

I have a Dynaco 400 with a missing diod block. Thus resulting in a dynaco. I was wondering if anyone knew of a replacement part and what the spec of the original were? I think it is the same block as the hafler dh 200 but I don't have any specs on that one either.
Help is much appreciated,
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Old 13th January 2003, 03:40 PM   #2
HDTVman is offline HDTVman  United States
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Join Date: Aug 2001
Location: Chicago area
I'm sorry I don't have the specs. for the bridge of the Dynaco ST400 for you. I do however own both of those amps. The bridge in the Dynaco should be rated fo 200 volts and 25 amps. I'd go for a 35.amp bridge myself. The Hafler operates at lower voltage and current that the big Dynaco so I don't think they use the same bridge but it could look similar.

What ever makes the tunes flow
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Old 13th January 2003, 08:32 PM   #3
diyAudio Member
Join Date: May 2002
Location: wheeling illinois
I have worked on lots and lots of dyna400's over the years
and have never ever had a diode bridge failure. After putting
in the new bridge, before you turn it on, pop the 4 fuses
and turn it on. One of the main electrolytics might be shorted
in which case something is going to pop, so stand back when
you turn it on.
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Old 15th January 2003, 01:36 AM   #4
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Join Date: Sep 2002
Location: B/R , La.
thanks Bruce ,
that's what I needed to know, I ordered a new 200 volt 35a form digi for a whopping $2 and some change
and thanks Kevin, I will do that. My cousin's went out about four years ago and he had a tech replace it but it was the only thing wrong in his. I hope i am that lucky.
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