Clementine 6L6G with 5U4/5R4 Thread

sweet & juicy SE amp for 1626 Darlings and the 6L6 family

Postby Shannon Parks » Tue Sep 20, 2011 9:45 am

DeathRex wrote:If you have a extra 6V filament supply you can put that on your 5R4 with a CL60-70 in series. The CL will greatly slow down the turnon time for the 5R4. Alternatively you can try a CL-150 or 110 with a slighly high 5V filament (5.3-5.6) in series to slow down a 5R4. The CL-150 will drop about 0.67 volts at 2 amps, and 0.61 volts at 3 amps when warmed up.


This is a cool idea.

Shannon
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Postby Shannon Parks » Thu Sep 22, 2011 6:31 am

OK - finally reverted to the regular non-tube rectified build as per the docs listed in the top post. It is working very well and I'll post a hookup and voltage chart shortly. Power output and distortion measurements are to be done, too. Here's my mods to the posted schematic and parts list:

- UF4007s are easier to work with. I used 1N4007s as that is what I had on hand.
- I added a wire loop jumper between pins 1 & 8 on the power tubes (V2 & V3). While I may add this trace in the future, it works great as a test point for the bias voltage.
- I changed R19 and R18 to 2.4K, 2W resistors. Paralleled with the 1K, 3W resistors at R17 and R20 this gives an effective resistance of 706 ohms. I was targeting 19W for using 6L6GAs.
- I put a CL90 in series with the fuse. This puts the voltages right where I want them and tames the start up voltages in the power supply. I think I'll spec a similar inrush for the Darling version (the Darling uses too little current for the CL90).

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