audio-talk

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.

Good spot Max. Thank you.

Ok, I had to get more b+ so I got the blue bariac. Tuned up anode and g2 voltage to 400v which is max for both. With both at 400v the bias is 25v 35mA so dissipation is 15 watts which is conservative as max combined is 25watts. Estimate power between 1/4 3.7 W to 1/3rd 4.9 watts. Cant hear distortio...

Ive two more nos both sellers only had one. One is Langrex the other isnt a person known. Going rate it 35 plus carriage. Worth every penny. You can get used tested for 20 +.

Just had to try it same pinout as EL34. https://i.postimg.cc/k4zXVx8G/IMG-1267.jpg https://i.postimg.cc/Vkgf9yM3/IMG-1268.jpg I took a look at has a lovely bright cathode, beautiful to behold. Looked at the EL37 data. I dont think its the same. My b+ is 275v its dissipating 7 watts the 620 ohm rk is...

Thanks for the remider. Finding the EL36, it confirmed my view it is a dead duck. Disgracefull distortiin. Shame it doesnt have 10Y or 801a. Good that GM70 at full power is as good as it measured for me. But also the 211 holds its own, and considering there is more reasons not portrayed in any chara...