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Actually, Adrian, I'm glad I didn't buy one of those, because finding short M5 metric screws here in the back-country of the USA would have been a real challenge? 8-D 73, Steve K0XP

I asked to join the 9500 group a week or two ago, but never heard back. I did search the 87A group's archives and have seen Glenn post there. But I've never seen any discussion of any other amp other

There is an Alpha 9500 group HERE: /g/Alpha9500 Glenn, AE0Q posts/replies there often. 73, Alan W5ARM

True, for that one cover page; however, the links don't go through the Wayback machine, so they don't come up with pages. One has to copy the indicated url for a link into wayback machine in order to

W4ZT.COM <http://w4zt.com/> IS GOOD. 73, Mike Mysliwiec KF8OD

Yes, indeed; but my point is that all of this fantastic old amplifier reference material is now on it's way gone... so anybody wishing to personally archive any of it had better get busy saving

Try the Internet Wayback Machine. There's a good chance you will find it there. Mod-U-Lator, Mike(y)/W3SLK

Try with http://www.archive.org https://web.archive.org/web/20230830230406/https://w4zt.com/

Unfortunately, it seems that any reference to the original W4EMT's material is gone, too? 8-( 73, Steve K0XP

FYI….I met Tony King many years ago for the first time at the Shelby, NC. Hamfest. ?Toby was with a group of guys including Ron K4POZ. ?They were best of friends and worked together on converting

Old news to some, perhaps... I think he died some time ago; but W4ZT's amplifier web sites, mostly showing big Russian tubes such as the GS-35B but also with links to many European Russian tube sites,

On Sun, Dec 3, 2023 at 01:58 AM, Dave w6de wrote: > > > > Ceramic Disk Capacitors are used as RF bypass capacitors in RF > circuitry--that is to short RF to ground. And Capacitors can be also

Thank you, Reid. I was only thinking about the RF part. I ignored the DC plate current part of the equation. Forum readers, please excuse my oversight. Meanwhile, I have found in my spares a NOS in

That might be caused by a short from B- to ground (safety diode?). In that case anode current is measured via the grid current shunt resistor and shown as grid current as well. 73 Peter, DJ7WW

Hi Dave, the need is for a dc return, nothing in the way of capacitors will work. Using AC on the filament a center tap for the dc return will null hum voltage. The concept was raised of using a small

It’s hard to know what someone did there. ?It’s a mess. ?If the B- has a safety diode somewhere and it’s shorted the grid meter will respond in kind with the plate meter ( a la Ameritron) the

Considering the condition of that modified amp, I wonder if perhaps the grid current circuitry is miswired, and has always indicated something, but the operator just didn't realize it wasn't reading

I use? 10 x 1N5408 diodes in series for aprx 7.2 vdc bias on my drake amps ( 2 x 3-500Z's)...... and they are 2650 vdc on RX.? Idle is then 100 ma.? ?(and just 40 ma on the lower CW / 1900 vdc

YOU NEVER WANT A FILAMENT TRANSFORMER RATED MORE THAN?NECESSARY!! ?here’s why: Filament transformers are designed to deliver the rated voltage ONLY when the rated current of the tube is drawn of

Va3dxv, do you need a filament transformer for a 3cx1200a7? ?I’ve got about 3 of them here right out of AL1200 amplifiers. ?If this will hflp you contact me direct email. ?Lou Sent from the all