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Restored 1950’s Dynaco Tube Amplifier Courtesy of Jim Ehlers.
Custom rims wholesale…instantly.
21 Comments
Nice amp! I have a rebuilt ST 70 I put a new input board and the SDS Labs cap board in it.
Wurly, where can i buy this vu meter ? could you put this a exactly model ? thank you. (i have a ST70)
Real cool! I am glad that young audiophiles are into tubes. Thanks to you more vintage repro. is becoming available. Thanks for keeping DIY audio alive.
Hello Jim.I have a restored st70 triode.
I like de meters very much.Can you gif the adress or website where i can buy it.
Regards Peter from Nederland.
Can you tell me where you got your meters from? Thanks
where can i buy those meters? is there a website?
I’ve added a video response to the ongoing conversation. I built a custom set of Dynaco Mark III’s before the retro kits were available. I had the same idea and built them into the chassis as can be seen in the video. Great way of integrating bias checking without having to pull out and plug in the good ‘ol multi-meter.
Are the volt meters sitting directly on top of the output transformers? I have a Yaqin MC 10l and I think the heat from my transformers would fry the voltmeters.
Can you post a link for the volt meters ?
Thanks
Nice Wurly i think its a great idea, I’m going to upgrade an ST-70 soon, can you tell me your source for the meters? I can’t seem to find them.
David
i have a pair of dynaco Mk3’s. the thing about bias is that its better to measure the bias off each power tube separately. that means 4 meters. the reason is that each tube will age differently and adjusting the bias total of two tubes will not balances the bias between the tubes. example: if one tube is at 0.50 and the other at 1.00 you will sill read 1.5 on the total. best to measure and adjust each tube separately. i have my mk3’s set up this way.
cool stuff jim!
Again, you could also go into the chassis and make the connections inside to make it look a bit better. I’ve been playing around with my arrangement as to make it robust. Some people may want to buy some oct sockets from AES and push them into the front.
You will be amazed how much the bias changes over the period of warm-up of a few hours. Even changing out a rectifier tube will require a re-adjustment.
Regards,
Jim Ehlers
You can either make the connections for the bias within or outside the chassis. I have my wires (temp only) pushed into pin 8 and 3 on the front of the chassis. These are the socket pins for setting the bias. Pin 8 should read 1.56 and pin 3 is grounded.
You will want to supply the meters with around 6 volts. They are recommended up to 12 volts but that makes them way too bright. Anyway, get a transformer that supplies 6 volts and wire them in parallel.
I have the same question. Thanks.
What the hell are those bias meters? Frickin Cool! I want them on my Dynaco ST-70!!
Sweet ST 70. I recently purchased 2 of these voltmeters for my unit and would like the details of how you hooked them up. Where are you picking up the 5 volts? Thanks.
Nice ST-70…great pink floyd album too!
Great Unit. How about some details on how to hook up the Digital Volt Meters? Thanks. Nice going.
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Great amplifier, of course. I don’t know if you like Manley amps but check”EL34 Manley Snapper” here on YT. It’s very impressive too. Your comments will be very appreciated.