1 tube - tube booster for guitar....

[skipwave]

[quote author="NewYorkDave"]I have one of those. It's been sitting around for years because I never liked the way it sounded. Anyone wanna buy it? :wink:[/quote]

I never used the 901, but I have the rackmount RT-922 preamp and like it alot. It's a pretty simple design, no ICs, just a few transistors and two AX7s. Although, the EQ controls are pretty useless.

The BlueTube sounds good in front of a dull sounding amp, IMHO.

 

[blandman74]

[quote author="skipwave"]

I wonder how the 12U7 section of the Sopht amp would sound on it's own, without the 12K5 driver.
http://www.sopht.ca/index.php?s=26[/quote]

Actually, I did just that. See here.

I used *two* 12U7 tubes off a big (500mA, I think) wall-wart supply (regulated) to supply both the heater voltage and "B+" and used it as a boost . It sounds quite nice. (Sound sample is at the link, as well as schematic.)

EDITED. Thanks, Skipwave

 

[skipwave]

[quote author="blandman74"][quote author="skipwave"]

I wonder how the 12U7 section of the Sopht amp would sound on it's own, without the 12K5 driver.
http://www.sopht.ca/index.php?s=26[/quote]

Actually, I did just that. See here.

I used *two* 12U7 tubes off a big (500mA, I think) wall-wart supply (regulated) to supply both the heater voltage and "B+" and used it as a boost . It sounds quite nice. (Sound sample is at the link, as well as schematic.)[/quote]

Nice work! I might have to copy your design. Thanks so much for sharing.

By the way, there is an error in your URL, an extra
"L" at the end. I fixed it in this post.