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Old 17th May 2010, 10:13 AM   #441
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Thinking of testing different tubes with this same circuit instead of 26 tube. Any suggestion for matching and fine sounding alternate tube for 26?
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Old 17th May 2010, 01:27 PM   #442
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Quote:
Originally Posted by coolzero View Post
Thinking of testing different tubes with this same circuit instead of 26 tube. Any suggestion for matching and fine sounding alternate tube for 26?
You are going to have to change the filament voltage for just about any other tube. If you can vary this voltage, then I would try the following tubes in the same circuit: 10, 56, 112. The 56 and the 10 can handle higher plate voltage, and make sure to check the plate load. The 56 is indirect heated and also different socket, but it shouldn't take too much modification to get there. I wonder if for the 56, you could tie the heater to the cathode and run it like a DHT? I hope you have a variable filament supply!!
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Old 17th May 2010, 04:10 PM   #443
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Originally Posted by eboz View Post
You are going to have to change the filament voltage for just about any other tube. If you can vary this voltage, then I would try the following tubes in the same circuit: 10, 56, 112. The 56 and the 10 can handle higher plate voltage, and make sure to check the plate load. The 56 is indirect heated and also different socket, but it shouldn't take too much modification to get there. I wonder if for the 56, you could tie the heater to the cathode and run it like a DHT? I hope you have a variable filament supply!!
Thanks Eboz. Changing filament voltage is not a problem for me. But which of the tube has the most superior sonic advantage out of all these?
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Old 17th May 2010, 06:05 PM   #444
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Originally Posted by coolzero View Post
Thanks Eboz. Changing filament voltage is not a problem for me. But which of the tube has the most superior sonic advantage out of all these?
I think you should try all of them, really. But if you have to choose one, I guess the 112 as it is similar and possibly exceeding that of the 26. Try it and let us know!
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Old 17th May 2010, 09:56 PM   #445
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Old 17th May 2010, 10:43 PM   #446
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Alternatives to 26 are 10Y and 01A for good sound. I've tried a bunch and that's what I'd recommend for a line stage. I actually like 1G4G but it's too microphonic for general use. VT-67 is a good sound but 10Y and 01A are better. Haven't tried 46 in a line stage - may be interesting.

Andy
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Old 17th May 2010, 11:13 PM   #447
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Quote:
Originally Posted by coolzero View Post
Thinking of testing different tubes with this same circuit instead of 26 tube. Any suggestion for matching and fine sounding alternate tube for 26?
i use one cricuit for tube 26, 45, 6c4c. it is very exelent, no hum no noise.
you see:
HQ-DHT (All tube DHT amli) 26-45-2A3
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Old 18th May 2010, 03:02 AM   #448
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Quote:
Thinking of testing different tubes with this same circuit instead of 26 tube. Any suggestion for matching and fine sounding alternate tube for 26?
You could also try filament starving (ie reducing the voltage) to reduce THD.
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Old 18th May 2010, 06:51 AM   #449
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Quanghao, thanks for sharing! looking good!

You have Fans on the filament circuit heatsink?

Please post the filament circuit, if you changed anything.
I post in this link:
HQ-DHT (All tube DHT amli) 26-45-2A3
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Old 18th May 2010, 11:10 AM   #450
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Quote:
Originally Posted by eboz View Post
I think you should try all of them, really. But if you have to choose one, I guess the 112 as it is similar and possibly exceeding that of the 26. Try it and let us know!
Quote:
Originally Posted by nicoch46 View Post
Quote:
Originally Posted by andyjevans View Post
Alternatives to 26 are 10Y and 01A for good sound. I've tried a bunch and that's what I'd recommend for a line stage. I actually like 1G4G but it's too microphonic for general use. VT-67 is a good sound but 10Y and 01A are better. Haven't tried 46 in a line stage - may be interesting.

Andy
Quote:
Originally Posted by quanghao View Post
i use one cricuit for tube 26, 45, 6c4c. it is very exelent, no hum no noise.
you see:
HQ-DHT (All tube DHT amli) 26-45-2A3
Thanks guys for all your suggesstions. I will try whaever possible and post the results eventually.

Last edited by coolzero; 18th May 2010 at 11:26 AM.
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