Search found 45 matches

by WntrMute2
Mon Jul 12, 2021 2:39 pm
Forum: Aesthetics, Look & Feel
Topic: My best effort so far, a 300B SET
Replies: 3
Views: 1363

Re: My best effort so far, a 300B SET

Beauty! I have started your video series. Nice stuff.
by WntrMute2
Sun Jul 11, 2021 3:37 pm
Forum: Aesthetics, Look & Feel
Topic: My best effort so far, a 300B SET
Replies: 3
Views: 1363

Re: My best effort so far, a 300B SET

Lovely build! I have to ask about the tube rings and also about the mA meter. I need to source a couple for my 3C24 build coming up. Any info or is it in the video?
by WntrMute2
Sat Jun 19, 2021 3:00 pm
Forum: Audio Bench & Dummy Load Setup, Test Equipment, Etc.
Topic: Bench Power Supply Search (Info and WTB)
Replies: 0
Views: 907

Bench Power Supply Search (Info and WTB)

Hello guys and gals. I am looking for a bench power supply to experiment with. Something that will run up to 500V and maybe have a LV tap as well. The choices on Ebay are staggering so recommendations would also be welcome.
TIA
by WntrMute2
Wed Jun 02, 2021 6:53 pm
Forum: General Tube Audio Based Discussion
Topic: Capacitor input versus choke input
Replies: 8
Views: 2163

Re: Capacitor input versus choke input

Nice discussion here. I am planning for a mercury rectifier PS in my next build using 866As. I think I remember something about those needing a choke as the input. Any thoughts on that subject?
by WntrMute2
Fri Apr 23, 2021 4:14 pm
Forum: Discussion on Oscilloscope Video Series
Topic: What am I Seeing Here?
Replies: 16
Views: 4647

Re: What am I Seeing Here?

The OD3s give me 295 B+ and about 150V on the plate. Will scope the waveforms a bit later. Someone recommended chokes instead of plate resistors. Hammond 156C was the recommendation.
by WntrMute2
Fri Apr 23, 2021 11:29 am
Forum: Discussion on Oscilloscope Video Series
Topic: What am I Seeing Here?
Replies: 16
Views: 4647

Re: What am I Seeing Here?

Thanks for all that!
I could try the OD3, that would give me regulated 300V I believe.
This is going to sound really stupid but why do I need a plate resistor at all? If I have 214V B+, can't I just eliminate the resistor? Obviously, I need better understanding of tube circuits!
by WntrMute2
Thu Apr 22, 2021 3:26 pm
Forum: Discussion on Oscilloscope Video Series
Topic: What am I Seeing Here?
Replies: 16
Views: 4647

Re: What am I Seeing Here?

Two volts seems possible without distortion. Works fine in most situations but I would like more "headroom" for certain situations. There are two tubes in each channel. A #76 as the first gain stage and a 2C22 as the second. Both tubes have a leak resistor the # 76 has a 1M and the 2C22 ha...
by WntrMute2
Wed Apr 21, 2021 5:05 pm
Forum: Discussion on Oscilloscope Video Series
Topic: What am I Seeing Here?
Replies: 16
Views: 4647

Re: What am I Seeing Here?

So, I'm trying to determine why my waveform flattens at higher volume. I have the yellow channel on the output and the blue channel on the grid of the second stage tube. Note the difference in shape and PP voltage. There is feedback in the circuit, I wonder if that could be the issue. Both channels ...
by WntrMute2
Mon Apr 19, 2021 12:09 am
Forum: Discussion on Oscilloscope Video Series
Topic: What am I Seeing Here?
Replies: 16
Views: 4647

Re: What am I Seeing Here?

No change in the performance from inception. Just trying to wring all the performance that I can out of this project.
by WntrMute2
Sun Apr 18, 2021 10:05 pm
Forum: Discussion on Oscilloscope Video Series
Topic: What am I Seeing Here?
Replies: 16
Views: 4647

Re: What am I Seeing Here?

The load resistors I am adding at the jacks and well as measuring at are 47K.