Dynaco-Doctor Forum

Welcome! Need support, you got it. Or share your ideas and experiences.

Dynaco-Doctor Forum

dynaco 70 problem

63.249.70.89

[ Follow Ups ] [ Post Followup ] [ Thread: Display Email Next ] [ Dynaco-Doctor Forum ]

I just blew out my rectifier tube. I took my tubes to a repair clinic and they told me that all the tubes were running way hot. He said that in almost all cases it was leakage in the caps which would gradually cause too much power to flow through that tube, thus blowing it. He told me I should replace all of these caps. I know of the main big cap to the right of the rectifier tube, but where are the other ones? Should I consider an upgrade to eliminate this problem or should I go ahead and find replacement parts & new tubes??

Follow Ups:

Get Curcio's replacement board - Paully 11:38:32 09/01/06 (0)
It is worth it. It is more reliable and should, in theory, sound better. I have it but I won't say how it sounds in comparison to a can cap as I never directly compared the two. I will say it does sound fantastic and is worth the money on reliability alone. If you have to spend the money a little extra isn't a big deal. Toss out the C note and get it.
Re: dynaco 70 problem - CheckthePIN5Connection 12:23:43 08/31/06 (0)
Seen Grids go +, happened on a Dyn MKIII...the tube went in to melt down...a new 6550 took about 120mA b4 shut off...tested had less than 20% of life left after that...surprisingly fuse and rect. did not blow.
Cause, PIN 5 cable was not connected...solder joint dropped out.
Check Output socket Solder joints and connections, all of them.
Re: dynaco 70 problem - Joe Curcio 11:52:31 08/30/06 (0)
Most common - large quad cap
2nd most common - output tube sockets (will fry output tubes)
Less common but sometimes a problem - bias caps and selenium rectifier
Hardly ever a problem (but still not = 0) - coupling caps

This post is made possible by the generous support of people like you and our sponsors:

Kimber Kable

You can not post to an archived thread.