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Post by ineedtherapy (Stuart) on Sept 23, 2018 17:31:29 GMT -7
Can anyone verify that it’s safe to run a matched pair of Gold Lion KT66s? Of all the octal tube complements I see people suggesting, I haven’t seen anyone discuss KT66s...
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Post by daddyelmis (Greg) on Sept 23, 2018 18:21:21 GMT -7
I’m currently using KT77s in my therapy and like those very much - I run the therapy as a clean amp currently. The 77s are sonically similar to the 6L6, just “more” — if that makes sense.
I’m not sure I’ve seen anyone report using KT66 but I’m sure someone will post if they have. I think Doc said he tried 6L6, EL34, KT77, and the JJ 6V6 (it seems to the one 6v6 that can take the voltage).
There’s a thread in this forum where Doc posted his findings - you’ll find it with a quick search.
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Post by ineedtherapy (Stuart) on Sept 23, 2018 18:37:51 GMT -7
I’m not sure I’ve seen anyone report using KT66 but I’m sure someone will post if they have. The reason I ask is because I have a matched set of Gold Lion KT66s I put in my Therapy on Friday and they seem to be more harmonic than the 6L6s that were in it previously. Those 6L6s may have needed to be changed in the first place. I am more or less just wanting to verify that they’re safe to use since I hadn’t read any reviews of KT66s in the Therapy. It caused me to second guess myself.
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Post by Jaguarguy (Mike) on Sept 23, 2018 18:44:19 GMT -7
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Post by ineedtherapy (Stuart) on Sept 23, 2018 19:23:32 GMT -7
I did a quick comparison of the tubes on Wikipedia and their respective pages show identical functions for each pin. I’m guessing that means it is likely safe, but I did email Don just to be sure. Edit: It looks as though the KT66 is a part of the 6L6 family which might explain why there isn’t much tonal difference to my ears. My comparison of the two shouldn’t be relied on though. The 6L6s were older whereas the KT66s were brand new and I played an Antidote prototype with EL34s between tube rolling.
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Post by premiumplus (Dave) on Sept 24, 2018 6:22:26 GMT -7
Heater current in a 6l6 is ~ 0.7A, in a KT-66 it's listed as 1.27A and 1.5A on different data sheets. About the same as an EL-34. Doc always overspecs his power transformers. Please let us know what Don says, I'll be interested in what he says, and hearing how it sounds if you do load up the amp with the KT-66 tubes.
I've tried all kinds of tubes in my Therapy and I love it with KT-77's. But recently I got a Nova amp and I was comparing it to the Therapy, so I put the 6L6's back in. They'll stay for a while, it sounds great.
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Post by ineedtherapy (Stuart) on Sept 24, 2018 7:49:10 GMT -7
Please let us know what Don says, I'll be interested in what he says, and hearing how it sounds if you do load up the amp with the KT-66 tubes. I've tried all kinds of tubes in my Therapy and I love it with KT-77's. But recently I got a Nova amp and I was comparing it to the Therapy, so I put the 6L6's back in. They'll stay for a while, it sounds great. I did tube roll with them on Friday, but I didn’t run the amp long. They retained the warmth of the 6L6 tubes, but to my ears they seem more harmonic. I’m not going to power it back up until I hear back from Don, but I’ll paste his response to this thread so others can know. I may try to record a clip and upload it to YouTube if he gives the green light, but I’m technologically limited with only my iPhone to do the recording so it will be compressed and probably not that great of a sound. You may be able to at least get a general idea from the video though since you’re already a Therapy owner. In other news, I’m also getting a Remedy in this week. I had prototype #2 of the Antidote, but it rattled the can lights in my church so I wasn’t able to hang onto it (due to the money I had in the amp, I couldn’t afford an attenuator and the Antidote proto). I did, however, score a BL SA over the weekend for $120 and was able to buy the Remedy with money left over from the sell of the Antidote. I’ll be using the BL to run the Therapy a little hotter.
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Post by Jaguarguy (Mike) on Sept 24, 2018 9:00:10 GMT -7
I noticed GC has the Antidote now - asking a bit more than it's worth. Let's see if anyone bites
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Post by ineedtherapy (Stuart) on Sept 24, 2018 10:16:27 GMT -7
They gave me $1200 for it and I couldn't turn that down. They may have given me $1200 simply because I listed it on Reverb for $2200 lol.
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Post by mudman on Sept 24, 2018 15:28:31 GMT -7
They gave me $1200 for it and I couldn't turn that down. They may have given me $1200 simply because I listed it on Reverb for $2200 lol. I think a local shop had one that sold pretty quick for $1500. $1200 traded in to a shop is reasonable. Wasn’t a prototype though.
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