Tubes?

[turbo]

Tubes work diffrent then SS parts.

much much much diffrent.

ohm's law does not apply to tubes.
Voltage is generated as the electrons accelerate and hit the plate.
most of the times the circuit is fed with a DC signal.
for example when you take a microphone as the input you usually switch it in series with let's say a 6 volt DC source because otherwise the AC signal from the mic will try to pull a push circuit which will result signals in the wrong way and in energy loss.
therefore we switch in the 6 volt DC so the signal from the mic will always be positive, the AC signal will simply add to the DC signal.
like the AC signal is 0 +1 +3 +1 0 -1 -3 -1
then the signal with the added 6 Volt DC would be +6 +7 +10 +6 +5 +3 +5 etc, always positive with respect to the tube.

then in the second stage the condensors will decouple the signal and the end tube will amplify the incoming signal quite powerfull even with a low input signal.

i am doing a great study on tubes and i am starting to understand what Steven means.

M.

[innovation_station]

well i went tube shopping today and i managed to find 1 6bq7a tube for 5 bucks and i bought an old tube radio

so i came home and just found the data sheet for that tube it explains all about that tube here is the link

http://tubedata.tigahost.com/tubedata/sheets/155/6/6BQ7A.pdf

ist

[turbo]

Nice 

does the radio still work?

M.

[innovation_station]

hello marco it sure does it is a 1943 westing house am all tube radio  there are about 5 tubes in it there inst much else inide it a few resisitors model # is 808L5

ist

[BEP]

Ahhh! What we used to call 'The All American 5 tuber'. I'm sure it wasn't invented in the US.

There was a day when I could draw the schematic from memory. Lots of hummmm. Lots of heat.

It may be easier for most to do the test/design stuff with SS but not me.