Document uploaded to Post 13.

Try http://frank.yueksel.org/sheets/084/6/6BV7.pdf there are AWV data sheets there.

there are AWV data sheets there.

Already posted in #13 above.

Well, after looking at that data sheet, if you weren't using the diodes, you could rewire the socket and use a 6M5 and I bet nobody could tell the difference in volume. Just make sure of course that the bias is -5.0v as needed by the 6M5.

What was it with Radio & Hobbies fitting the 1956 Lt General with the 6BV7, Why did they use mostly AWV valves in that set,

did they get some sort of a deal using all this manufacture.

5 years earlier they had the 1951 Lt General valve lineup with 6AN7,6N8,6M5 and 6X4 which in my opinion was a better choice than the

6AE8,6BH5,6BV7 and 6X4 in the 1956 version,

Hi Brad how did we go with the 6BV7 comparison photo ?

Photo uploaded to Post 4.

The most common version I've seen are the black ones, not sure if they were made that way (like some of the 6AQ5's were), or became black after overheating.

The inside of the glass was painted black in an attempt to improve the plate dissipation.

Thanks Ian interesting point.

In reading the LTGeneral brief, Radio & Hobbies wanted a constructors radio in the Lt General that was minimalistic Design and so they said the 6BV7 suited their needs with enough gain so as they could do away with a preamp, and in their view, most of the constructors had good coverage in a big city and the 6BV7 would be sensitive enough to do away with a preamp and give a couple of watts output.
In its last incarnation it looks like a 6M5 doesn't it?

Looking at the specs the 6M5 pentode seems to have appeared within many triode pentode tubes. 6CK6 video amp can sub a 6M5 as long as you tie pin 6 to the cathode.

A case of not re-inventing the wheel. Many early tubes just had heaters & bases changed while the rest remained the same.

Document uploaded to Post 4.

" In its last incarnation it looks like a 6M5 doesn't it? "

Actually it looks even more like a 6EM5, a vertical output bottle that AWV was championing in the early '60s, taller. I have one of these later ones in my AWA 209C

Following is copied from a post in the TV section, where it might have been missed.

I did a 6BV7 replacement using a 6GV8 in my AWA 212C I'll draw it up and send it to Brad. It works extremely well.

The extra audio gain allowed me to move the sound IF B+ from the 260 volt rail to the 150v rail. This has several advantages:

1. Allows some FM limiting action to happen so that the fine tuning no longer alters the volume.
2. Improves the AM rejection (measured displaying PM5544 test card) by 6dB.
3. Lowers the 150V rail slightly so that the black level tracks contrast pot settings better (after my DC coupled video mod).
4. The 6AU6 no longer runs stinking hot - my set had a dead one in that socket.

The pentode in a 6GV8 is a bit like the old 42 / 2A5 / 6F6 output bottle, it needs 560 ohms in the cathode. Very different to the similar-looking 6GW8. But with this and 3.3k in the triode's cathode, no cathode bypassing is needed to get more than adequate combined audio gain. Makes it very simple to implement.

6GV8s are plentiful and don't carry an Audiophool price premium.