Ah, I thought so. ;-) The rectifier tube should be a 5AR4 to run the output tubes up where Dave Gillespie intended them. A 5U4 won't hurt anything but it drops a good bit more voltage than the 5AR4, like 30 volts or more. I think the amps would sound much better with 5AR4s. I built a pair of those and they're very very nice amps.
The Sovtek 5AR4 is actually not great. My 5V4G types sounded better but they are 175mA max. Voltage drop was similar. Don't have other types of 5AR4. The 5V4G is quite a bargain since it gets unjustly overlooked. It's my current favourite.
I am very pleased also. Listening as I write! Be preaching to the choir if I tried to explain how I like the sound! But, I am playing through a pair of Boston acoustics HD5 mini speaker with a partsexpress 500 Watt amp and 12" sub. The B.acustic were sourced from an E-waste bin and I replaced the toasted woofer for a pair of Peerless sds 5.25. I'm trying to muster the parts for a floor model with JBL 2225 15" with JBL 8" fullrange running as midrange with LCY 103 tweeter. Missing the 8" but have a source. That's my plan so far!
Cheers
Cheers
Grovergardner, How are you? When you assembled the 4M did you change the power cord. I see that my pair are still running well on the very small cord.
Francis
Francis
Yes, it's a VERY rich, deep sound! An EL34 Williamson is a wonderful amp. Good luck with assembling the JBLs, what a great project!
To answer your question, I did utilize an empty octal socket for an IEC connector, but really just for convenience. I don't think it's necessary.
To answer your question, I did utilize an empty octal socket for an IEC connector, but really just for convenience. I don't think it's necessary.
Getting two SS diodes in series with the GZ34 plates won't help to circumvent the 60 µF filter capacitor limit. Putting them in parallel with the tube surely would, but also sacrifices the slow turn on feature and render the tube superfluous at all.
Best regards!