Dynaco 400 diod block ?

billybeer · 13th January 2003, 03:14 PM

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,
thanks,
Bill

HDTVman · 13th January 2003, 03:40 PM

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.

Later
Bruce

kevin gilmore · 13th January 2003, 08:32 PM

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.

billybeer · 15th January 2003, 01:36 AM

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.

13th January 2003, 03:14 PM	#1
billybeer diyAudio Member Join Date: Sep 2002 Location: B/R , La.	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, thanks, Bill

13th January 2003, 03:40 PM	#2
HDTVman diyAudio Member 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. Later Bruce __________________ What ever makes the tunes flow

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13th January 2003, 08:32 PM	#3
kevin gilmore 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.

15th January 2003, 01:36 AM	#4
billybeer diyAudio Member 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.