Well I hope you get your Scotts restored! Nice that you have the cabinets too.
I went to visit a good friend today and he gave me two NOS matched pairs of 7581A's for my 296! A couple are the light base versions. He said he got these plus another matched quad as extras with a couple of amplifiers he recently bought. I had mentioned to him last month that I wanted a quad of 7581's that were NOS. Today I swapped the 6L6GC's I had in there and the new tubes are working out great. Nice as the 7581 are what originally came in the amplifier. The NOS vintage Sylvania 6L6GC's I had in the amplifier at first wouldn't fit inside the cabinet. These are "short as they come" and still almost touch the top. Check out the $4.55 price on the boxes
When I rebuilt the 296 I added bias voltage pots to the existing balance pots so it was very easy to bias the new tubes. These should last a while.
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FINALLY! Someone who's talking about the tubes that the 296 was designed around, the 7581/KT66! I know, I'm a year late to the party, I just found this link while researching the HH Scott 296. Normally I wouldn't comment in a year old thread, but felt compelled to this time. Most people talk about the 6L6GC as though that's the tube that the Scott 296 came with, it's not, as I'm sure most of you know. I just found it curious most of the 296 owners/experienced users immediately go to the 6L6 for this amplifier as though it's a 6L6 amp. I suppose I could run 6L6GC tubes in my Citation V but I'll stick with the 7581/KT66 tubes that it was designed around. Not to mention that, to me, I'll take KT66/7581 tubes from a SQ standpoint, over any 6L6 variant, but that's just my opinion, I understand completely that some of you might prefer the 6L6 sound, I have no problem with that.
As for McIntosh, to Twiiii who said "nah" to the Scott 296 and then went to the Mac C-22 and a pair of mono blocks as what he'd rather have. NO ****! Twiiii goes on to say, "not everyone can afford Mac gear", then goes on to say that he's got 20 Mac pieces, all tube. Show off! The 296 sells for around $1000 and the Mac C-22 preamps are now going for $4500-$6000 and up, and you don't have an amp or amps yet. I don't know what a pair of MC 3500 amps cost but the last pair I saw on eBay were listed for $59,999!!! I don't think they sold for that much but let's say they're worth 10% of that, that makes them a $6000 pair of mono blocks. Imagine an $10-$12,000 setup consisting of an preamp/mono block amps sounding better than a $1000 amp, who'd have thought!? Really? Does the term "apples to oranges" mean anything to you? Although it's actually more like "Kia to Ferrari", in this case, IMO.
I think the HH Scott 296 is a nice amplifier with some good iron but remains an integrated amplifier from the 60's. How about comparing a Mac integrated to the Scott 296, seems like a more "apples to apples" approach, even though the "McIntosh" emblem is on the Mac piece! Come to think of it though, you just don't see too many people bragging up their vintage Mac integrated amps. I had a Mac MA230 a number of years ago, it was alright but not better than the Scott 299 that I just finished refurbishing.