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eBay doesn't bill for ads. They get a final value fee for sales.

Robin No problem. how many do you want? I am near Bicester in tier 4, so probably not an essential journey for you? let me know Chris HJ

No, I was talking about ESRC1 Tube Warehouse, located on Pinecastle Blvd, in Orlando. FYI There is also another tube dealer in Orlando; Vacuum Tubes Inc at 1080 Sligh Blvd. However AFIK Stan had the

Hi David, I'll try, I'll see if I've got his email. Cheers Robin

In Kenilworth any good ? Though I think Craig Sawyers is closer to you as he lives near Oxford. (He left the mailing list a while back but I don't believe his email address has changed). David

Slip of a finger, it's a 7603 Robin

Hi Nenad, I don't dispute any of that, but rather add one thing, and that is, ion sputtering can only occur if the CRT is gassy. I have spent a good bit of time playing with sputterers used to coat

Tom, I concur. I've been offered money (not much, though I got it in a bargain lot including a bunch of other stuff from a couple of guys who gave up their Colorado garage start-up business trying to

Hi, Need to give my 7003 and some plug ins a good going over. Is there anyone in the Cotswolds area (U.K.) who has an extender that I could borrow for a couple of days ? TIA Robin Birch

The 7904A has a switching power supply. Using a Variac is not a good idea. DaveD -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

Fantastic find! Use a variac if you want to be cautious on turn on. a/ Get service manuals DL from TekWiki or BAMA Archive: Check SN range as there are different manual sch etc for various SN ranges.

hi Miguel, hi Tom, great idea, I try to find a TR503, but what value should the crystal have? I am waiting for the 7613 mainframe to replace the 7603 mainframe, with the 7613 mainframe I should make

Perhaps my statement wasn't precise enough, I meant to say "if the interface layer was behind the double peaking phenomenon...", not question the interface layer existence per se. Oxide cathode is so

I second David's advice. If it ain't broke, don't break it. -- Cheers Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070

Please don't shotgun replacing electrolytics, the odds are you'll do more harm than good. Some of those multilayer boards can be problematic when de-soldering components - you SO don’t want to strip

That's a great suggestion, Miguel. I went the other direction many years ago to convert a 502 to work with a 492. It was a pretty quick conversion once I was able to find a suitable crystal. So

You can buy a 503 change the crystal and use the nano to retune the 2nd band pass filter -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de Attilio Enviado

No not really ... unless one's reality is "reality T.V. shows." I think, most of the people doing this have a box of old, dusty, and used tubes, sitting in the basement... that will "sell on Ebay, for

Good, clean data on the 5687/6900 is available here: https://www.pearl-hifi.com/06_Lit_Archive/08_Tube_Data/Cons_Data/5687_6900_Cons_Data.pdf Having been thru many 100s of 5687s, as seen here:

Which 500 series was the 6900 used in? (I believe 6900 a twin medium mu triode.) 6AX7/12AX7 was high mu. Bendix was (their gone) an interesting company, involved in the aerospace industrial military