Sorry. My mistake.
Have you? You are broken mentally so it wouldn't show.
Sorry. My mistake.
Have you? You are broken mentally so it wouldn't show.
Just look it up online. Type in 6AC7 and see what comes up.
I don't really need to do that. I know what the 6AC7 is/was. I was just trying to clear up the confusion over how many grids are shown on the original drawing.
I will help you. There are *three*.
Read my post above. I said "The original drawing shows 3 grids." I even explained how the poorly drawn symbol could have been mistaken as having four grids.
I saw that but was counting the cathode!
NT
Yet you're the one ragging on someone else for a mistake that you're making right in your bitch. Amazing. But such stupidity is expected from you.
This is what I was thinking Bill. Having equal length leads "60 inches or less" on the input and output implies to me that feedback may have been intended. The circuit would thus oscillate and effectively become a transmitter.
This assumption seems to be supported by the very high gain and (deliberate?) lack of bypass.
Unfortunately, I have no further details on the device itself.
But I do have a similar circuit, also using four 6AC7's, from another source which I will redraw and post on a new thread in a day or two.
Robert Miller
The circuit as drawn will do nothing. There's no cathode connection to ground. Assuming anything (ground at the bottom of the 200 ohm resistors ?) with this odd circuit may lead one down the garden path ...
Ed
The redraw is not accurate - in the original drawing the cathode resistors all connect to the supply transformer centre-tap (0V) via the
100 milliamp-ammeter.piglet
50 years ago we wouldn't even be having this discussion. It just goes to show how very seldom these devices arise in designs nowadays.
AFAICR, the cathode does count. So if this tube has 3 grids, it's a
*pentode*. We don't bother about heaters.
Some illegible (and possibly vital) text from the original is also not clarified or even included in the redraw.
And how slow the Internet was in 1967. ;)
Cheers
Phil "O brave new world that has such people in't" Hobbs
I think what tabbypurr meant was that he mistook the cathode for another grid.
Hehe! You're a funny guy, Phil. :)
An understandable mistake. Could have happened to *any* blind person.
Thanks for the comments. That's the return for the 6.3V across pins 2 and 7. I left it out for simplicity. I should have mentioned that. Sorry.
Robert Miller
Fine. But four grids does not make a PENTAgrid .
I admit I made a mistake (essentially a typographical error). My response was not to correct a typo, but to correct a mistake in understanding.
Are you on the rag?
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