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Post by Deleted on Aug 8, 2014 7:19:03 GMT -7
I haven't seen this question asked yet....
Can the Therapy safely run other octal tubes? I have owned another cathode biased amp that would accept other tubes; however, I'm wise enough to know better than to assume this one does too. Circuits are always apples to oranges.
Whaddya say, Doc?
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Post by DRZ on Aug 8, 2014 12:15:35 GMT -7
I believe you can, I tried a variety of 6L6 based variants, EL 34 and also liked the KT 77 a lot, and JJ 6V6's sounded nice as well. But I must say I favored the JJ 6L6 the best.
Just plug -n- play, the amp is Cathode biased at 270 ohms which is a low or slightly cold bias point, so any Octal Beam Power tube with a 7AC pin configuration in a medium range will work.
Z
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Post by markT on Aug 8, 2014 13:26:53 GMT -7
Sweet!
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Post by "Z" Steve on Aug 8, 2014 13:40:39 GMT -7
My doctor just told me I will need Neurostimulation Therapy for my back pain - I wonder if this is what he meant? This Therapy (amp) is sounding greater everyday!
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Post by Deleted on Aug 8, 2014 17:52:23 GMT -7
I believe you can, I tried a variety of 6L6 based variants, EL 34 and also liked the KT 77 a lot, and JJ 6V6's sounded nice as well. But I must say I favored the JJ 6L6 the best.
Just plug -n- play, the amp is Cathode biased at 270 ohms which is a low or slightly cold bias point, so any Octal Beam Power tube with a 7AC pin configuration in a medium range will work.
Z Way cool!!!!!
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Post by jesslm02 on Aug 8, 2014 18:17:29 GMT -7
Nice. I'd like to try it with jj 6v6 myself.
Sent from my Galaxy S4 using Proboards
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Post by simpleton on Feb 23, 2015 16:27:02 GMT -7
I believe you can, I tried a variety of 6L6 based variants, EL 34 and also liked the KT 77 a lot, and JJ 6V6's sounded nice as well. But I must say I favored the JJ 6L6 the best.
Just plug -n- play, the amp is Cathode biased at 270 ohms which is a low or slightly cold bias point, so any Octal Beam Power tube with a 7AC pin configuration in a medium range will work.
Z I bet this info posted in the sales pitch of the Therapy would even increase the desirability of the amp more. Other companies boast the same capability....but they don't sound like Z's. I'm excited to try the KT77
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Post by pcns on Feb 24, 2015 10:06:44 GMT -7
I am sure the other tubes will sound good but every time I try out smarting the Doc I end up back with the factory tubes and the best possible tone.
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Post by Pete aka shouldb on Feb 27, 2015 6:57:43 GMT -7
I am sure the other tubes will sound good but every time I try out smarting the Doc I end up back with the factory tubes and the best possible tone. ABSOLUTELY THIS!!! ( for me anyway...... YMMV )
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Post by doctorice on Feb 27, 2015 7:03:15 GMT -7
I believe Doc's early Therapy prototype had a switch to facilitate using different tubes. Mike (jaguarguy) scored one of these. Lucky devil
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Post by headshrinker (Marc) on Feb 27, 2015 7:53:15 GMT -7
I'm pretty sure that is his Antidote. I'm sure he will let us know. The Therapy is cathode biased, self biasing so no switch is necessary. Just plug and play.
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Post by pcns on Feb 27, 2015 8:05:28 GMT -7
The Antitode proto had the switch
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Post by doctorice on Feb 27, 2015 12:06:39 GMT -7
I'm pretty sure that is his Antidote. I'm sure he will let us know. The Therapy is cathode biased, self biasing so no switch is necessary. Just plug and play. The Antitode proto had the switch That's right. My mistake.
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Post by simpleton on Feb 27, 2015 22:21:56 GMT -7
It's not always about sounding better ... often it's just about sounding different. The scope of sounds available with the Therapy is really wide and varied...adding in the ability to swap some tubes around and it's staggering how wonderfully diverse this amp is. At least to me it feels that way.
This amp is really fun.
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Post by mudman on Jun 6, 2017 5:16:01 GMT -7
Bumping an old thread! I'm considering getting a therapy and using it with 6v6 tubes. Can any 6v6 be used or only the jj's? Would it be safer to run a 5y3 rectifier with the 6v6?
Thanks all!
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Post by Deleted on Jun 6, 2017 9:29:17 GMT -7
I run a 5AR4 with TAD 6V6's and have had no issues. Sounds glorious.
EDIT: And a 5751 in V1...
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Post by mudman on Jun 6, 2017 15:10:30 GMT -7
Thanks for the heads up. My gas has (momentarily) subsided. Just got a celestion blue for my Maz and that Cured my need for Therapy. For now at least. I had found one used for $1000 and was finding it hard to resist. Unfortunately the Maz cab is the only thing I'd have to run the therapy through. I could scrape up funds for the head If I sold a few pieces but not a cab to go with it.
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Post by premiumplus (Dave) on Jun 6, 2017 16:21:09 GMT -7
I tried 5881s, 6V6s, EL34, and ended up like Todd did, back to the 6L6s. As is usually the case, Doc knows what he's doing and he does it way better than most. Z amps are the ONLY amplifiers I've ever owned that I did not modify in one way or another. It's amazing. I could ALWAYS make other brands sound better, but with Z Amps I have yet to make an improvement. Thanks Doc, you're an amazing engineer.
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Post by JasonM on Jun 6, 2017 21:23:52 GMT -7
I tried some TAD 6v6s a while back and liked the results. But I too prefer the JJ 6l6s in there the best. I do like the 5771 on occasion when more clean headroom is needed In the v1 spot.
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kirk
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Post by kirk on Jan 10, 2020 18:49:43 GMT -7
I read this post a while ago, misremembered it and put KT88s in my therapy by mistake. They’re out now. But they sounded great! The amp seems fine, but now that I’ve checked back here and The Dr didn’t mention them as being o.k. I scared to put them back.
Would it be o.k.?
Thanks
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Post by Chilly Gibbons (Todd T.) on Jan 10, 2020 19:57:01 GMT -7
The KT88 draws 1.6A of heater current and the EL34 draws 1.5A, so probably. But I’d refer to Doc just to be sure. He designs and builds these things (all of his amps) like Panzers, so I’d be surprised if the answer was no.
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kirk
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Post by kirk on Jan 11, 2020 13:03:49 GMT -7
Thanks. That doesn’t sound like a big difference in heater current. I bet you’re right and the good Dr has over-specified all the bits that are involved. (Would we mainly be worried about the power transformer? I have to admit to very rudimentary technical knowledge.)
If he doesn’t chime in here, I’ll send a question in to support - I’d love to use the Therapy with those KT88s for my weekly jam next Friday! It really worked with the stuff we were playing last time.
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Post by helmi on Jan 11, 2020 16:12:16 GMT -7
If he doesn’t chime in here, I’ll send a question in to support - I’d love to use the Therapy with those KT88s for my weekly jam next Friday! Let us know what Doc says!
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kirk
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Post by kirk on Jan 17, 2020 14:31:28 GMT -7
I did send a message in to Repair, but haven’t heard back yet. I have a brand new set of Genelex Gold Lion KT88s just waiting... I’ll let you know as soon as I hear. They really sounded great. You’re gonna want to try them.
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Post by premiumplus (Dave) on Jan 17, 2020 20:07:35 GMT -7
I'll have to try them if they work out. I'll say this...I love the Therapy with KT-77s.
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Post by Chilly Gibbons (Todd T.) on Jan 18, 2020 6:25:33 GMT -7
Thanks. That doesn’t sound like a big difference in heater current. I bet you’re right and the good Dr has over-specified all the bits that are involved. (Would we mainly be worried about the power transformer? I have to admit to very rudimentary technical knowledge.) If he doesn’t chime in here, I’ll send a question in to support - I’d love to use the Therapy with those KT88s for my weekly jam next Friday! It really worked with the stuff we were playing last time. Yes, sorry I didn’t see your question. The power transformer can overheat trying to supply the requisite current for heaters if the load is too high. As you can see and feel when you lift a Z amp, they come with very large power trannies that enable rock solid power supplies for their designs. That’s one of the reasons that Z’s amps are so loud and powerful for their respective tube compliments and power ratings. They don’t fart out. And the trannies are the most expensive part of the circuit, so when you factor in other quality parts and that they are hand built and tested one at a time, you’re getting an excellent value.
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kirk
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Post by kirk on Jan 28, 2020 10:16:54 GMT -7
I just got off the phone with the Doc. (Nice guy. Answered the phone himself.) He says that KT88s will not hurt the amp. Go ahead and try them!
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