SE build

[Asdain]

So i have been messing around with an AX84 SEL build lately and it sounds pretty great, but not as great as it could! so i reworked the schematic a little and tweaked here and there, changed the switching to independent gain controls for clean and mean mode... blablabla..
I ended up with something pretty close to the Daisycutter that the glorious Randy Fay posted on AX84 some time ago.
I asked him for some input on my design and he mentioned some changes he made to the modern daisycutters

it is NOT YET implemented, i will do that over the weekend.
I used the Speaker from that project for something else now too.

Speaker suggestions!! Single 12" Open back Cab!
Go!

[tubeswell]

someway of reliably measuring the plate and screen current for the 6L6 would be a good idea. With that 1k bias pot, its hard to work out what the actual tube current is at any given point on the dial. The 10Vdrop across the 1st (100R) supply resistor indicates 100mA current at that point, most of which is presumably going through the 6L6 plate. With the indicated plate and cathode voltages you have and allowing 5mA for the screen, and 1mA for each preamp stage, that would at a rough guestimate by my calcs, make the 6L6GC be running at 31W. Therefore it might be wise to put a 1R 1% resistor (with a test point at end end) in series with the bias pot. JM2CW

[Asdain]

someway of reliably measuring the plate and screen current for the 6L6 would be a good idea. With that 1k bias pot, its hard to work out what the actual tube current is at any given point on the dial. The 10Vdrop across the 1st (100R) supply resistor indicates 100mA current at that point, most of which is presumably going through the 6L6 plate. With the indicated plate and cathode voltages you have and allowing 5mA for the screen, and 1mA for each preamp stage, that would at a rough guestimate by my calcs, make the 6L6GC be running at 31W. Therefore it might be wise to put a 1R 1% resistor (with a test point at end end) in series with the bias pot. JM2CW

these test points are pretty useless imo, since you can always measure the voltage drop across the OT primary. Also i do have a little octal-octal adapter with a 1Ohm resistor installed on which i can measure the cathode current.
the Voltages are just rough Estimates.
the 6l6 will be running at 90% dissipation at about 73mA on those calculations, the preamp draws a little over 5.4mA, 6.2mA for the screen
total current about 84mA. i rounded the Power supply Voltages.

i anticipate the voltages a little higher actually. Since the Powertransformer is not loaded to full rated current. the Voltage after rectification could be around 395 Volts actually, i have to build this modified circuit and measure it first. Higher voltages would be overall very welcome in this design.

what i mostly need now is sensible recommendations for a speaker, 1x12" open back combo. want a nice full and balanced sound. should do the very high gain good as well as nice cleans.
G12H30 maybe ? the Greenback would probably be too in your face mid bite. same probably goes for the Vintage 30. maybe an Eminence Wizard or Private Jack would work too,.. or a WGS Reaper or Retro,.. i don't have much experience with all of those and would love to hear some input

[Cygnus X1]

Hey!

Cool to see you here.

[Asdain]

Hey!

Cool to see you here.

haha, nice to see you here too man.

but tbh,.. i don't like it here as much as on MLP

[tubeswell]

these test points are pretty useless imo, since you can always measure the voltage drop across the OT primary. Also i do have a little octal-octal adapter with a 1Ohm resistor installed on which i can measure the cathode current.

horses for courses

what i mostly need now is sensible recommendations for a speaker, 1x12" open back combo. want a nice full and balanced sound. should do the very high gain good as well as nice cleans.
G12H30 maybe ?

I used a G10 30W (UK) greenback in the last SE I did and it sounded alright to my ears. Something about the 10" voice which suits SE - dunno why. Soundbyte FWIW http://music-electronics-forum.com/atta ... t-trem.mp3