SSS 002 LAYOUT

[67plexi]

ic-racer, Thanks' for clearing that up.

Steve.

[DR103]

Revised layout below,

Just a minor tweak to the filter input.

The layout is untested so assume it has errors.

Thanks,
Aaron

Has anyone verified this build?

[mhartman]

Revised layout below,

Just a minor tweak to the filter input.

The layout is untested so assume it has errors.

Thanks,
Aaron

Has anyone verified this build?

http://ampgarage.com/forum/viewtopic.php?t=21508

[pula58]

Hello Everyone,

I won't be so bold as to suggest this could be an error, but I'd appreciate any and all comments on this:

I am curious about the voltage across V7 in the SSS #002 schematic. I don't see any reference to tube types in the schematic, so I will assume V7 is either a 12AT7 or a 12AX7 (although 12AU7 might be a reasonable choice). We have +379V on the anodes and -40.4V on the cathodes, which places a whopping 419.4V across the tube! The 12AT7 has a design limit maximum of 300V while the 12AX7 (and 12AU7) have a design limit max of 330V. Can this tube be expected to have a long service life?

Many thanks - this is an invaluable forum!
Lou

I'm late to the pary here...but..I have the same question as Lou.
Do the SSS "type" amps have any reliability problems with the cathode follower in the PI due to large plate volts across the tube used as dual cathode follower?

[mhartman]

Hello Everyone,

I won't be so bold as to suggest this could be an error, but I'd appreciate any and all comments on this:

I am curious about the voltage across V7 in the SSS #002 schematic. I don't see any reference to tube types in the schematic, so I will assume V7 is either a 12AT7 or a 12AX7 (although 12AU7 might be a reasonable choice). We have +379V on the anodes and -40.4V on the cathodes, which places a whopping 419.4V across the tube! The 12AT7 has a design limit maximum of 300V while the 12AX7 (and 12AU7) have a design limit max of 330V. Can this tube be expected to have a long service life?

Many thanks - this is an invaluable forum!
Lou

I'm late to the pary here...but..I have the same question as Lou.
Do the SSS "type" amps have any reliability problems with the cathode follower in the PI due to large plate volts across the tube used as dual cathode follower?

The tube is a 12ax7 in the SSS models. I use JJs in my builds and haven't had problems. That being said, SSS02 runs the voltage on the CF higher than some of the later SSS models.

[talbany]

SSS's that use the CF driver are basically running in class AB2..This can provide for a larger grid swing (and eliminate grid clamp effect) on the power tubes, the result? more power and a tighter low end due to DC coupling (excursion)..So consideration must be met to not over dissipate the plates at full tilt so you may need to adjust your idle bias point to compensate for Max output power..That's all I have to say about that!!
My advice is do some research on class AB2 operation!..Some tube maunals are a good place to start.

Tony