Budrew... Just buy two GEC's and plug them in - you'll notice a new sense of emotion to your music. The improvement is rather significant.
Prior to trying this in my amp, I emailed McIntosh to find out if putting KT88's and 6550's in the same amp at the same time was okay. They replied saying - No problem, the tubes are electronically the same.
Look for GEC's with the 3 getters and the Z date codes. That's about all you need to know. Let your ears tell you the rest.
RE: Electro-Harmonix, I believe they are not exactly a tube company - they buy tubes from "real" manufacturers and then brand them Electro-Harmonix. If you read a review which said the EH are good, odds are they were the Svetlana KT88's which have received good press. Just so happens the McIntosh branded tubes in your amp are also Svetlana. Two GEC's and 6 Svetlana's in that amp will be a HUGE eye opener.
No joke.
Prior to trying this in my amp, I emailed McIntosh to find out if putting KT88's and 6550's in the same amp at the same time was okay. They replied saying - No problem, the tubes are electronically the same.
Look for GEC's with the 3 getters and the Z date codes. That's about all you need to know. Let your ears tell you the rest.
RE: Electro-Harmonix, I believe they are not exactly a tube company - they buy tubes from "real" manufacturers and then brand them Electro-Harmonix. If you read a review which said the EH are good, odds are they were the Svetlana KT88's which have received good press. Just so happens the McIntosh branded tubes in your amp are also Svetlana. Two GEC's and 6 Svetlana's in that amp will be a HUGE eye opener.
No joke.