Photo Discussion

[Sjef]

Originally posted by fdegrove
Hi Sjef,

Seems you're posting in stereo....errrr, well, almost.
Cheers,

Just be glad I'm not a 5.1 dolby surround guy

[fdegrove]

Hi,

Just be glad I'm not a 5.1 dolby surround guy

We're sure keeping you busy tonight, aren't we?

Cheers,

[Sch3mat1c]

Originally posted by fdegrove
Hi,

Very nice stuff.

BTW, the 6P3P is the Chinese equivalent of the 6L6 if I'm not mistaken.

Cheers,

Erm... Russian... And 6P3C[-E] is the 6L6GB (not GC, but it won't melt in a GC amp). <Colt correct my Cyrllic plz >

Tim

P.S. Frank and EC8010, keep discussion on the discussion thread

[fdegrove]

Hi,

Erm... Russian... And 6P3C[-E] is the 6L6GB (not GC, but it won't melt in a GC amp).

To the best of my knowledge the Chinese manufacturers used to ( or perhaps still do) the same coding system as the Russian do.

P.S. Frank and EC8010, keep discussion on the discussion thread

I don't know where you get the idea but EC8010 isn't even involded in this thread.

Cheers and cheer up,

[wd40]

To the best of my knowledge the Chinese manufacturers used to ( or perhaps still do) the same coding system as the Russian do.

For once the greats quantity adoptd the former Soviet Union technique in Chinese early phase , therefore the vacuum tube also adopts such naming means .

[wd40]

audioman:"this my new amplifier push pull 845"

Great !Transformer Phase Splitters ?

[PassFan]

Okay, here is my new amp which is a push pull 6L6 Ultralinear design by Hafler. It uses a 6SL7 input with a 6SN7 driver. I am sure the more astute of you will notice the mismatched output tubes which is the result of a dropped tube (first one I ever had break). So now I am waiting on another matched set. For the age of the design (1961) it sounds great so far. It ain't single ended but it ain't solid state either.

Some of you may recognize it from my Running Tube Amp Construction thread.

[Jan Deckers]

Posted a picture of my amp. I uses a 300BXLS from KR. The output tranny is a amorphous core and silver secundairy windings.
The driver is a 27 in a mu-stage configuration.
My preamp uses an old posttube the Ba, also switching it for the Aa.
regards,

Jan

[fragman56]

Tim said:

I would presume it has little to do with linearity about Vg=0V, and everything to do with having a cap-coupled driving stage. Often used in RF for class C stages: grid current has to go somewhere in this circuit, and it flows through the grid leak, back into the cathode, developing a negative voltage across the grid leak, biasing the grid negative. As a result, bias is always equal to the peak voltage of the input signal.

Wouldn't the grid be more positive than the cathode assuming grid current flows through cathode via grid resistor? How do you develop a negative voltage across the grid leak?

Just trying to understand,
Rick

[fdegrove]

Hi,

Shunt gridleak biasing principles are explained here:

It's not very common in recent tube preamps but it used to be in Western-European circuits by Telefunken, Studer et all in the Sixties....



Cheers,