audio-talk

there is one balloon px25 and a pair of osram kt66 in the auction but its online tese days i doubt they wont be cheap. ill be selling my valves in time. im not bidding. there is also a taylor valve tester. but its all tv repair man stuff, so very little of interest to me and I have a prior apointmen...

Thanks Nick. I guess I'll find my way. now that the old laptop has updated at least it is now able to unzip. but it has a different failure mode than the newer windows 11 laptop. so I have two ways to find out a fix. in one place Ronald states the only 3 files you need. it may be easiest to get thos...

Oh wow is me. I was all set to buy the uTracer 6 kit and the up to 100v positive grid board. But the email from Ronalds wife suggests you make sure you can download the gui before you pay. Well our laptop is horendous probably full of junk. It failed to run the gui version 3/11 you must start with. ...

Forget Sukuma.

Definately not. I dont need my utracer anyway as Ive discovered the late great Patrick Turner had trod the path before me. Ive put my operating point at the top 5k6 loadline. Patrick had put some stuff down at the bottom left. I measured 3.7 watts. Im thinking change from E88 Cc to EL38 driver, eith...

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