Can that be done?
+2
HarryY
Dogstar
6 posters
ST-120: KT88’s in front KT120’s in back
Dogstar- Posts : 361
Join date : 2014-06-23
HarryY- Posts : 46
Join date : 2019-07-24
Location : NY
I would say No because it will be unbalanced
Roy Mottram- Admin
- Posts : 1839
Join date : 2008-11-30
anything can be done . . . . but does that make it better, or just different, or just a bad idea, or maybe a great idea
Dogstar- Posts : 361
Join date : 2014-06-23
I’d be willing to experiment if it won’t cause resistors to pop or caps to fry. I have Sovtek KT88’s and TungSol KT120’s. But I want a guarantee that it won’t freak out my amp.
deepee99- Posts : 2244
Join date : 2012-05-23
Location : Wallace, Idaho
Why?
Bob Latino- Admin
- Posts : 3263
Join date : 2008-11-26
Location : Massachusetts
Dogstar wrote:I’d be willing to experiment if it won’t cause resistors to pop or caps to fry. I have Sovtek KT88’s and TungSol KT120’s. But I want a guarantee that it won’t freak out my amp.
This won't hurt the amp BUT it is not an optimal situation for running the amp. If you had TWO Sovtek KT88's and TWO Tung-Sol KT120's, what I would do is run the two Sovtek KT88's in ONE CHANNEL and the two Tung-Sol KT120's in the other channel of your amp. It is better to match up a tube in a pair with one of the same type. Just a note here > Sovtek stopped making KT88's about 3 years ago. The Sovtek 6550 (WE version) will work in the same situations as the old Sovtek KT88 and IMHO is more rugged that the old Sovtek KT88.
Bob
Dogstar- Posts : 361
Join date : 2014-06-23
I have 2 Sovtek KT88’s that got very little amp time one I got the KT120’s and then the GL KT88’s. I had no intention of investing more Sovtek tubes...just using up the ones I had.
audiobill- Posts : 425
Join date : 2014-03-13
Location : Albany, NY
Your amp is push-pull; your suggestion is like having Laurel on one end of a seesaw, and Hardy on the other. It should work, but.....
Dogstar- Posts : 361
Join date : 2014-06-23
So what if I have two GL KT88's and two Sovtek KT88's? Would it be better to put the 'matched' pairs in separate channels? Or as I asked originally?
Bob Latino- Admin
- Posts : 3263
Join date : 2008-11-26
Location : Massachusetts
Dogstar wrote:So what if I have two GL KT88's and two Sovtek KT88's? Would it be better to put the 'matched' pairs in separate channels? Or as I asked originally?
I would put the two GL KT88's in one channel and the two Sovtek KT88's in the other channel. You always want one tube of a push-pull pair to be matched with one of similar characteristics.
Bob
Dogstar- Posts : 361
Join date : 2014-06-23
Thank you ..
deepee99- Posts : 2244
Join date : 2012-05-23
Location : Wallace, Idaho
Again I ask. Why?
I see no happy ending.
I see no happy ending.
Dogstar- Posts : 361
Join date : 2014-06-23
Just curious...without having the innate understanding of electronics that most of you probably have I perceive things differently. Is the biggest problem with doing something like that the sonic weirdness it would do? Bob did say it isn’t harmful to the amp which is key to trying things like that. Not that I actually would just that I think strange stuff like that.
Bob Latino- Admin
- Posts : 3263
Join date : 2008-11-26
Location : Massachusetts
Dogstar wrote:Just curious...without having the innate understanding of electronics that most of you probably have I perceive things differently. Is the biggest problem with doing something like that the sonic weirdness it would do? Bob did say it isn’t harmful to the amp which is key to trying things like that. Not that I actually would just that I think strange stuff like that.
Think of a pair of output tubes in a push-pull configuration on one stereo channel like two horses pulling a wagon. You don't want the two horses to have different physical characteristics. (an old horse and a young horse, a strong horse and an old tired horse etc.) For best performance in pulling your wagon, you want two similar horses.
Bob
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