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Scott 299c 6u8 vs. 7199

While its logical to change OUT the 7199 now,
Given many peoples desire to have stock,
I can see a time in the future where many units having been converted to the 6u8 as a new sub for the 7199 get built, that a reverse conversion back to the 7199 will become popular.
The tide will shift eventually.
What that means for me today, nothibg really. Just an observation based on history. I mean, bell bottoms did it.
 
Andyman said:
If you don'rt find any, send me your address and I'll mail you a couple pairs to try.
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A friend of mine is a retired Bendix Corp. Guy who worked there 35 years. Along the way, he fixed tube gear on the side through the last 50/60 years. I bought his entire supply (sure he kept some back) of tubes and still have to sift through them all. Which is one reason i look to establishing a list of exact replacements for the 6u8 as well. So when i sift, i can watch for them. Ive began seperating power, rectifier, 4pin, Noval in groups ect and pulled what i recognize as i go. Having Mac and Scott gear, i looked at the tubes used and began to question that 7199 or its lack of clarity as far as not being written on my amp that i could see ect. Ect. So my purpose for all this is 2 fold i suppose. Ive really only dealt with this tube stuff the last couple years so am green. I have MC30, MC60, Couple of Scott tuners, the amp, Fisher preamp 400cx2 ect. Sold : the Mac c-22, VTL mb450, Dynaco st70, VTL st150 and the like.
Currently run Belle Klipsch (modified) mc30 pair, and Mac C-2200
 
allhartfidelity said:
Intriguing thought to roll some variants. I would like to do that, searching "6u8 tube equivalent " does show a bunch
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My 222c comes with 6U8's. I sub them with Siemens E80CF. They both sound good but DO make the amp sound different.

Depends on how I want to hear it. Right now I'm preferring how the E80CF's give the amp a tighter more prominent bass. The GE 6U8's in the amp give more of a midrange driven sound. It's cool having this option in addition to rolling all the other tubes to change the flavor. I dig it.
 
SWL3600 said:
My 222c comes with 6U8's. I sub them with Siemens E80CF. They both sound good but DO make the amp sound different.

Depends on how I want to hear it. Right now I'm preferring how the E80CF's give the amp a tighter more prominent bass. The GE 6U8's in the amp give more of a midrange driven sound. It's cool having this option in addition to rolling all the other tubes to change the flavor. I dig it.
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Thats good to know, thank you. I will be compiling a list of your tube choice, and reference as to characteristics. Working on a master list of sorts for these varients all in one place. Anyone with experience with this E80cf or any other varient please consider a contribution to my list. Anyone sees a varient I've posted a screeenshot of that may likely damage the circutry, please let me know. Here or PM whichever is most desired form of contact. All i will keep all uner names out. Some info being subjective, is still helpful as if the list grown enough, subjective become relevant if its a majority concensus.
 
As for getting another Scott amplifier, my experience has been that the very early LK-48, LK-72 and some 299 (talking 299C) series were the only ones with the 7199, although I have not seen a 299C or 222 with the 7199 but it has been said that some had them. (Remember all of the variations within a particular model??) My early, brown faceplate LK-48 and LK-72 both have 7199 tubes. But other amplifiers have usually 6U8/6GH8 tubes specified. My first edition 299 has ECF80/6BL8 tubes. All are Medium-MU Triode / Sharp-Cutoff Pentodes. So, you may not even need to bother with the 7199.

I have dealt with this vendor for years and I am very happy. They have NOS 7199 tubes listed for $22.00. They answer the phone so you can check availability.

http://www.esrcvacuumtubes.com/vacuumtubes_tubelist_tubes_FM1000-9006.html
 
7687 was Sylvania's answer to RCA's 7199 - same characteristics but with the pinout matching the 6U8. Not very common though.

As
 
kvflyer said:
As for getting another Scott amplifier, my experience has been that the very early LK-48, LK-72 and some 299 (talking 299C) series were the only ones with the 7199, although I have not seen a 299C or 222 with the 7199 but it has been said that some had them. (Remember all of the variations within a particular model??) My early, brown faceplate LK-48 and LK-72 both have 7199 tubes. But other amplifiers have usually 6U8/6GH8 tubes specified. My first edition 299 has ECF80/6BL8 tubes. All are Medium-MU Triode / Sharp-Cutoff Pentodes. So, you may not even need to bother with the 7199.

I have dealt with this vendor for years and I am very happy. They have NOS 7199 tubes listed for $22.00. They answer the phone so you can check availability.

http://www.esrcvacuumtubes.com/vacuumtubes_tubelist_tubes_FM1000-9006.html
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Nice, thank you for the source.
 
Sylvania had a number of special tubes in the late 50s through the 60s, odd stuff designed for audio that never really caught on. They were pretty cool spec-wise, but since its like shopping for unicorns it doesn't make a lot of sense to design something around them at this point in time.
 
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