Old tube amp

Per Nielsen · 8th February 2003, 03:32 PM

I just got a couple of 40 years old Dynaco mark3 tube amps they are pretty smashed up, so i am thinking on restoring them, but the trafos dosent work anymore, so here comes the question anyone how knows were I can get some, I can use instead?

I have also heard that the Dynaco mark 3 is a very good amps, even today! Is that right or is it totally inaudible???and not worth saving?

dhaen · 8th February 2003, 04:04 PM

Per,

Welcome to the forum

Which transformers don't work?
How did you test them?

Cheers,

Per Nielsen · 8th February 2003, 04:23 PM

Thanks!

The output transformers, the core is broken somewhere in both of them there is no connection on the primary side of the trafos.

Brett · 8th February 2003, 04:49 PM

Magnequest do reproduction ones from the original blueprints. But they're not cheap and shipping to Europe won't be either.

http://store.yahoo.com/triodeel/magnequest.html

Model MQ 431 CL

Perhaps someone in Europe could make a replica, or you could get some second hand off ebay. They come up regularly.

Per Nielsen · 8th February 2003, 04:56 PM

Thanks for the advise

Per Nielsen · 8th February 2003, 05:00 PM

Which tubes should I youse for the mark 3? KT88 or 6550 and what is the diffrence? Sorry! That might be a stupid question for you guess, but this is my first tube amp!

dhaen · 8th February 2003, 05:13 PM

Per,

Brian Sowter will wind some for you:

http://www.sowter.co.uk

He is always happy to quote.

Cheers,

fdegrove · 9th February 2003, 12:32 AM

Hi,

Quote:

KT88 or 6550 and what is the diffrence?

Historically and technically....,yes.

As far as NOS goes you may be able to unearth some NOS 6550s but hardly a decent KT88 GEC.

The Dynasours will be happy with either current production KT88 or 6550A.

There are more differences between the remaining manufacturers than between the type of tubes nowadays.

Cheers,

planet10 · 9th February 2003, 04:22 AM

Quote:

Originally posted by fdegrove
The Dynasours will be happy with either current production KT88 or 6550A.

Anything you might suggest, if the intention was not to restore, but to just use the iron?

dave

fdegrove · 9th February 2003, 02:15 PM

Hi,

Quote:

Anything you might suggest, if the intention was not to restore, but to just use the iron?

If it's just the output tubes you mean then this is intersting to read:

COMPARATIVE LISTENING TEST

Cheers,

8th February 2003, 03:32 PM	#1
Per Nielsen diyAudio Member Join Date: Feb 2003 Location: Aalborg, Denmark	Old tube amp I just got a couple of 40 years old Dynaco mark3 tube amps they are pretty smashed up, so i am thinking on restoring them, but the trafos dosent work anymore, so here comes the question anyone how knows were I can get some, I can use instead? I have also heard that the Dynaco mark 3 is a very good amps, even today! Is that right or is it totally inaudible???and not worth saving?

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8th February 2003, 04:04 PM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Per, Welcome to the forum Which transformers don't work? How did you test them? Cheers,

8th February 2003, 04:23 PM	#3
Per Nielsen diyAudio Member Join Date: Feb 2003 Location: Aalborg, Denmark	Thanks! The output transformers, the core is broken somewhere in both of them there is no connection on the primary side of the trafos.

8th February 2003, 04:49 PM	#4
Brett diyAudio Member Join Date: Jan 2002	Magnequest do reproduction ones from the original blueprints. But they're not cheap and shipping to Europe won't be either. http://store.yahoo.com/triodeel/magnequest.html Model MQ 431 CL Perhaps someone in Europe could make a replica, or you could get some second hand off ebay. They come up regularly.

8th February 2003, 04:56 PM	#5
Per Nielsen diyAudio Member Join Date: Feb 2003 Location: Aalborg, Denmark	Thanks for the advise

8th February 2003, 05:00 PM	#6
Per Nielsen diyAudio Member Join Date: Feb 2003 Location: Aalborg, Denmark	Which tubes should I youse for the mark 3? KT88 or 6550 and what is the diffrence? Sorry! That might be a stupid question for you guess, but this is my first tube amp!

8th February 2003, 05:13 PM	#7
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Per, Brian Sowter will wind some for you: http://www.sowter.co.uk He is always happy to quote. Cheers,