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Tube sockets are labeled 6L6GC and 7027 A. Tube substitution book lists KT66 as substitute for former and KT88 for latter. I have used KT66 but never thought of KT88 for the 240. Should I?
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Thanks Michael and Jim, I have tried 6l6GC, KT66, and s350B tubes. I like them all, but at the moment the Tung Sol 6L6GCs are what I am running. I will forgo the KT88 option, but I am still curious as to why the 7027 is listed in the Sams tube substitution book as an alternative for the 6L6GC and the 7027A is listed as an alternative for KT88
It's simply an error. A number of tube substitution guides list the 12BY7A as a sub for the 6BQ5! No way...
NO
The Mc240 could handle a KT88 for a bit and I have tried it but you don't gain anything as far as power because it isn't set up for a KT88. The filament current is considerably more in the KT88 as opposed to the 6L6Gc and 7027 tubes..The KT66 is also more than the 6L6gc or the 7027 as well however since you probably aren't using the C8 preamps that plug into the amp's octal sockets,you have the extra reserve filament current to run KT66s.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Edits: 02/14/15
What Mike said! The KT-88 is by NO means a sub for a 7027.
I'd use the KT-66 Genalex reissue. Killer tube.
Wonderful tube the Genelex KT66..The other nice one is the TungSol 6L6g coke bottle reissue.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
The only bad thing is that the price on the 6L6G has gone through the roof, New Sensor DOUBLED what they charge for it! Now a Tung-Sol 6L6G sells for significantly more than the Genalex KT-66.
The Tung-Sols went from selling for about $100 or so per quad to about $200!!
WOW!
Why did they do that?
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
The ruble is dropping like a rock and the dollar is going through the roof.
Even ladies of the night have doubled their rates because of it. Until Putin decides to act sanely and the price of oil goes up it will be like that.
I guess they didn't want to sell any more 6L6Gs...
I asked them the same question, and the reply was essentially "that's the way it is..."
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