6V6 line preamp

[disco]

Wot... cpb? jumpyer?

weekend .... you ?
well , but is

Psssst, Salas has gone sleeping - now we can have some fun....

[stajo]

Bypass, like our sooner doom now i have to score two goals if you excuse me. Later on we'll speak ctbp. Zlatan

[cjkpkg]

Been lurking here for a while...I think I will whack up this linestage on a DIY PCB. I have a regulated B+ and heater supply that will work nicely.

Thoughts on the layout? I didnt label anything but it is a pretty simple design. Only thing I am struggling with is the input ground on the "right hand" side.

I would P2P it but my chassis layout sort of demands as low a profile as possible.

EDIT

I plan to use a regulated 12.6V heater supply so 6V6's wired in series. Is this thinking OK? Supply is good for 2A.

[stajo]

Originally Posted by cjkpkg

Been lurking here for a while...I think I will whack up this linestage on a DIY PCB. I have a regulated B+ and heater supply that will work nicely.

Thoughts on the layout?
I plan to use a regulated 12.6V heater supply so 6V6's wired in series. Is this thinking OK? Supply is good for 2A.

Sure. Use same tube brands preferably. 6V6 is prolly ok but for example 6C33 i had examples where i had to match even filaments if putting them in series ps. who cares about football anyway?
Edit
And I would make a star-grounding b4 putting everything to chassie if I were you, looking at the pic.

[stajo]

Originally Posted by disco

Wot... cpb? jumpyer?

weekend .... you ?
well , but is

Dont mention the war. Ya jumpyer. Smaller bypassing the bigger. Quicker then. I hate football.

[disco]

Originally Posted by cjkpkg

I plan to use a regulated 12.6V heater supply so 6V6's wired in series. Is this thinking OK? Supply is good for 2A.

Being 'simple' for a design and performing well is no mean feat. I don't think a printed circuit board makes an improvement for the circuit as it's built from a handfull of parts, some bulky resistors and electrolytes which you may want to exchange in future.

For the voltage regulator a PCB might save you some space but again it's good practice to have this few parts hard wired to the reg on a sink. When heating 6V6 in series, be sure to use the 'GT' version as they have a fixed warm up period. Older types don't so you'll possibly ruin the heater. From a developper's view not so safe idea in my opinion.

Football? Tennis you mean

[stajo]

Dude I hardwired 2 SSHV2 on a cooler. I think it was somewhere there I had to consult my shrink. I recommend everyone to start discoing here. That means skip regs, build a proper c-r-c and listen. Then add **** and listen

Tennis is my life

[cjkpkg]

Originally Posted by buzzforb

Switched polarity of outputs leaving phase reversal. Trimmed voltage with everything hooked up to 340. Switching outputs stopped oscillation. Filaments are 6.07 and 5.99. Offset of about 20mV. Here we go.

I had mine wired up with a temporary PSU from another project I will likely abandon on a test bench. With switching of no signals or speaker hookups all I got was loud hummm. I switched the 6v6 pre output so signal goes to RCA output ground and ground goes to RCA output and hum was much less but no gain and the volume control in the path did nothing.

If I put the RCA cable signal (center pin) on the ground part of the RCA output(outer ring) then I get a clean, quiet signal with no gain but it is very quiet.

So, I am thinking I need to have all my signal wiring as per "normal" signal to signal and ground to ground and switch my speaker outputs on the power amp?

[cjkpkg]

Also, heater voltages in line, B+ of 315v, and 14V on the cathodes. Otherwise built exactly per the original schematic.

[buzzforb]

Originally Posted by cjkpkg

I had mine wired up with a temporary PSU from another project I will likely abandon on a test bench. With switching of no signals or speaker hookups all I got was loud hummm. I switched the 6v6 pre output so signal goes to RCA output ground and ground goes to RCA output and hum was much less but no gain and the volume control in the path did nothing.

If I put the RCA cable signal (center pin) on the ground part of the RCA output(outer ring) then I get a clean, quiet signal with no gain but it is very quiet.

So, I am thinking I need to have all my signal wiring as per "normal" signal to signal and ground to ground and switch my speaker outputs on the power amp?

THats what i ended up doing.