audio-talk

Ok now I’m in sefenth heaven. This amp is a keeper. Well thats my R core 5K6 into 8 ohm output transformers bagged for good. So now I’ll definately have to use the Sowter push pull transformers for the next project. Maybe I should do push pull 45? I was planning to use a lesser PP transformer for a ...

Strong looking fat bottles with big Kathode. Loving the sound.

That makes sense.

I did some assessment looking at the el37 triode cathode bias compared to its pentode bias. Studied the el38 pentode bias resistor, made me judge 300 oms. Found that a good idea. Had 29 watts so throttled down to 25 w dissipation . All good. Its the right way up at last. Very happy. Not putting the ...

Moral in the story is. I asked a guy called Mike who I believe was the Son of one of the big valve dealers. May have been Chelmer, I knew at the time though. Doesnt Mattaer. I said to Mike, “what is going to happen to our valves. (I meant will the go up i. Price of will they go down as the generatio...

But its better than knowing nothing. Is it though? I can see some merit for 2nd, but for 3rd and 4th, knowing nothing is to my mind, better than knowing something that is likely to be wrong, but not knowing if its wrong, and by how much. And of course thats before you ask if knowing 2nd-4th is enou...

Well you have to find the biggest fook off choke you can find for choke input. This one is a cube showing the EL34 to show how enormous it is. Because this power transformer is 500mA dc capable. So every other part has to be that capable. Youre case isnt so extreme. But success with chokes isnt an a...

Stephie gives more detail

https://www.jacmusic.com/techcorner/SBE ... o-dis.html

Anti emitic and very expensive when I was a nurse. Only given then to people on chemo.

Well the formula we have to accept right or wrong. But measuring errors could be mine. If the printer the artist the actual taking of measurements were right. It would be better to have a table of numbers and process those through the formula. But just as I have nothing to go on but a visual drawing...

Just what the maths came to. Its better now Ive made it fine lines so no judgement as to where the measurement within a thick line. Looks better result. Quite pleased with that valve.

The line is 3 I could minimise it to 1 for most accurate I could achieve when Im home again. The line at 3 is not an easy acurate target. It would be worth doing worst case scenario outer edge to outer edge, then opposite in to in. See what occurs.

The tube above 801a was a bit of a good condenter. But thumbing the Vade Mecum for similar powered triode connected multigrids I found a sleeper. Found them available from the east https://i.postimg.cc/8zDwyQZh/IMG-1271.jpg https://i.postimg.cc/sxhKLVFJ/IMG-1272.jpg https://i.postimg.cc/pXj1GBRt/IMG...

I’ve sent the email to order the uTracer 6 (1,000v) and the extra board for +100v grid bias and associated current measurement.