OK Boys and Girls....
Got a call today from the shop I took my 299 to for restoration and it is done. Hope to get up to Austin soon to pick it up. Can't wait to hear it!
The gentlemen told me it sounds great and a few of the tubes while still quite viable could be considered as candidates for replacement in the future.
So I have a few questions...
1. ECF80/6BL8: Driver tubes correct? European/American designations correct? Have been to the HH Scott site and verified these tubes are specific to the amp. Are there some other tubes that can be substituted for these that run as the originals would in the unit, voltages, temperatures, biasing etc?
2. 6BQ5/7189: Output tubes? European/American designations? Are there some other tubes that can be substituted for these? Have been to the HH Scott site and verified these tubes. I have read at Franks Electron site that the EL84 many claim to be a substitue for these is not correct and in fact could cause problems. It is the EL84M that would be the correct substitution. Apparently the 6BQ5/7189 runs at higher voltages than the EL84 does preventing it from being compatible.
I have been to Tubes and More and Upscale Audio looking around tonight. They seem to list the EL84 as a compatible substitute. What do you all know/think about this?
So.. substitute recommendations, sites/sources to find these tubes, the 7189 and 6BL8 seem to be a little scarce.
NOS vs. new? Brand recommendations and why. European vs. American.
I realize I am asking a lot but after perusing the forums here and with all the wealth of information posted and knowledge many of you have, I thought it prudent to post and ask.
Thanks in advance, I'll continue to update as my journey in vintage progresses!
Best,
Dave