| Per Nielsen |
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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| dhaen |
Per,
Welcome to the forum:)
Which transformers don't work?
How did you test them?
Cheers, |
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| Per Nielsen |
Thanks!
The output transformers, the core is broken somewhere in both of them there is no connection on the primary side of the trafos. |
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| Brett |
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. |
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| Per Nielsen |
| Thanks for the advise |
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| Per Nielsen |
| 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! |
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| fdegrove |
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,;) |
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| planet10 |
| 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 |
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| fdegrove |
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,;) |
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| planet10 |
| quote: | Originally posted by fdegrove
If it's just the output tubes you mean then this is intersting to read |
So based on their suggestion KT88s... anything suitable other than these? Triodes?
dave |
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| Brett |
| quote: | Originally posted by planet10
So based on their suggestion KT88s... anything suitable other than these? Triodes?
dave |
The Dyna OPT is 4300 ohms a-a, so,
300B / 2A3 / 6B4G
Trioded KT88s
EL84 trioded, parallel
and probably a few more when I get some sleep |
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| Per Nielsen |
Thanks for the advises!
So the best choice would be the kt88, but there is a couple of manufactors which one is the best? I am thinking on the sound |
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| Brett |
| quote: | Originally posted by Per Nielsen
Thanks for the advises!
So the best choice would be the kt88, but there is a couple of manufactors which one is the best? I am thinking on the sound |
I like the Svets a lot. NOS KT88s are stupid money for my tastes. |
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| Per Nielsen |
Thanks
Is there any body who has anoter opinion?
or else it will be the svets |
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| fdegrove |
Hi,
| quote: | | Is there any body who has anoter opinion? |
Not me...they're reasonably priced and reliable.
I'd go for them.
Cheers,;) |
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| Per Nielsen |
My first tube amp is working !!!
My Dynacos is now working!!
I have just yoused the night on rewindding the output trafos with copper core, and replaced the gz-34 tubes with dioedes
And it works and sounds fine
But is it healthy for the amps that I youse diodes insteads of the Gz-34's
Can a output tube be to old? the ones im using is more than 20 years! :bomb: |
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| fdegrove |
Hi,
Glad to see they're working again.
| quote: | | But is it healthy for the amps that I youse diodes insteads of the Gz-34's |
Most likely the B+ is now somewhat higher than before due to the lower voltage drop of the diodes,you may need to find out what it should be according to the Dyanaco circuit diagram and up the resistor value in the PSU.
| quote: | | Can a output tube be to old? the ones im using is more than 20 years! |
It wouldn't hurt to have them checked and replaced if necessary.
Circuit diagram:
UNCLE NED'S.
Cheers,;) |
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