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Post by gtrjunior on Jun 16, 2016 16:29:40 GMT -5
So I've been researching various power tubes that may jive well with the QR. I know from reading here that there are a few different brands that you guys like. I've also emailed a few of the online vendors. I've gotten various recommendations from Tung sol EL34B to JJ KT77. But the last email I got from the Valve Queen is what has me puzzled.
She recommended TAD, which as you probably know is a Chinese tube, likely similar to the stock tubes that come with the amp. She recommended these tubes citing a higher plate voltage on the QR.
Does anybody know any information about this? This is the first I've heard of that in this amplifier.
Does anybody know what the QR actual plate voltage is?
When I had my JVM I remember that I kept blowing out my V3(cathode follower). Upon researching I learned that, that socket in fact ran slightly higher voltage...about 105 mA if memory serves. Anyway, the only tube I could find that could handle the added voltage was the TAD brand. I installed one and never had another problem.
So before I go swapping out power tubes I wanted to know if anybody has ever had plate voltage issued killing their tubes?
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Post by TheFight on Jun 17, 2016 2:30:22 GMT -5
You know that's kinda funny that Valve Queen recommended TAD bcs Doug from Doug's Tubes told me she recommends the Ruby's for quickrods, which we all know are Chinese as well. I remember him saying the same thing about the higher plate voltage.I'm wondering if she actually just favors the tone or mby she gets a good deal on them. I'd personally try the the Tung-all tube before I'd try any Chinese tubes again. Just me
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Post by gtrjunior on Jun 17, 2016 6:45:24 GMT -5
I wanted to try Tungsol or the EH. But now I'm concerned about spending $100 on tubes and then having one or more fail. I'm thinking I should probably email Scott and ask him...
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Post by gtrjunior on Jun 17, 2016 6:58:29 GMT -5
I just emailed Scott...ill keep you posted as soon as I hear back.
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Post by gtrjunior on Jun 17, 2016 7:49:58 GMT -5
Scott said the plate voltage is "around 490". So now we know what to look for when shopping for power tubes.
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Post by TheFight on Jun 17, 2016 16:44:07 GMT -5
I think blowing a EH tube is highly unlikely, I've never done it and I've had the EH El34 in probably every amp I've owned, besides the Friedman. (6 amps with multiple tube swaps)
My buddy too. The only time that I blew a EH tube was when I was biasing my amp myself and wrong I may add.
I think you'll have the chance of any tube failing in general but a EH just sound highly unlikely. But I totally understand your concern.
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Post by gtrjunior on Jun 17, 2016 16:55:02 GMT -5
I spent a good chunk of today talking with Doug through email about this. Basically all of the Chinese tubes can handle up to 800vdc. Such as, Sino, Ruby and TAD. Many New Sensor(Russian) tubes can as well. This includes JJ, EH, and even Tung sol.
I looked up the spec sheets on all of the brands above. Doug was surprised that the EH could handle that voltage but he added that he wouldn't trust the New Sensor tubes above 450vdc. I didn't ask him why but I suspect that he may likely see more tube failures in higher voltage circuits. Seeing as how this is what he does for a living id bet he knows quite a bit more about the subject than I do.
But I was meaning to ask you (Thefight) about your experiences with the EH tubes so I'm glad you posted no issues.
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Post by gtrjunior on Jun 18, 2016 7:26:26 GMT -5
You know that's kinda funny that Valve Queen recommended TAD bcs Doug from Doug's Tubes told me she recommends the Ruby's for quickrods, which we all know are Chinese as well. I remember him saying the same thing about the higher plate voltage.I'm wondering if she actually just favors the tone or mby she gets a good deal on them. I'd personally try the the Tung-all tube before I'd try any Chinese tubes again. Just me So I just learned yesterday that Ruby makes a standard EL34B STR and they also make an EL34 for use in high voltage applications too....maybe that's why she recommends them for this amp...Doug also told me about them as well. |
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Post by gtrjunior on Jun 18, 2016 7:27:15 GMT -5
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Post by gtrjunior on Jun 18, 2016 7:30:03 GMT -5
At Less than $20 each the price is right too
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Post by TheFight on Jun 19, 2016 0:14:47 GMT -5
Wow that good to know, so the quickrod rod puts out more plate voltage that say a normal amp?
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Post by TheFight on Jun 19, 2016 0:17:55 GMT -5
I don't know that I like the Rubys dstr. I think I'm taking them out. If you want I can send them to you, if you pm me. No charge, you can have them and give them a try, see if you like them.
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Post by gtrjunior on Jun 19, 2016 6:51:27 GMT -5
Wow that good to know, so the quickrod rod puts out more plate voltage that say a normal amp? Correct....I don't think it's a ton more but more...yes |
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Post by gtrjunior on Jun 19, 2016 7:21:57 GMT -5
So I just looked up the average plate voltage....
Most guitar amps have between "350-450vdc" with some going higher. When I was researching tubes over the last few days most posts that I saw said that their amp ran around 470-ish.
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Post by cipher on Jun 28, 2016 23:20:55 GMT -5
The plate voltage on my Drop B+ Quickrod measured 422 in 100 watt mode, and 430 in 50 watt mode.
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