Tubes?

[z_p_e]

I'm having a string of good luck in regards tomy tube endeavour.

Recently I checked an old guitar amplifier I have that was somewhat butchered and thus does not work, and found out that it uses a 5U4GB tube in the PSU. The amp is missing the speaker output tranformer, but I'm sure I'll be able to find a suitable replacement later when I'm done with the experiments. This amp is quite rare I believe, it's a Valco Stage Star, with 2 12" speakers.

Then, today out of the blue, someone at my job was doing some housecleaning from down in the basement where they keep all the old junk equipment, and they were throwing out an old tube ultrasonic alarm system. Yes you read that right. Must be one of the first alarm systems ever designed. It's in good shape, and of course in combination with the guitar amp PSU, I'll be able to use the filament transformer from it to replicate the experiment Marco was doing.

I just need to find out what type of filtering circuit he was using on the output.

Cheers,
Darren

[turbo]

Jason, i took a picture of the colpitts osc from the old book as i believe this is the most stable oscillator.
There isn't really much to it.
sorry for the fuzzy images.
i just grab some caps and test what it does.

Marco.

[wattsup]

Think this might be a good read for the tubers.

http://www.ieee.org/portal/cms_docs_iportals/iportals/aboutus/history_center/oral_history/pdfs/Doring233.pdf

My late father was one of the first TV techniciens in Montreal area and we still have his bench intact with drawers of tubes.  I still remeber my Traynor amp with two 6CA7 tubes. Man did it ever blast.

[z_p_e]

Think this might be a good read for the tubers.

http://www.ieee.org/portal/cms_docs_iportals/iportals/aboutus/history_center/oral_history/pdfs/Doring233.pdf

My late father was one of the first TV techniciens in Montreal area and we still have his bench intact with drawers of tubes.  I still remeber my Traynor amp with two 6CA7 tubes. Man did it ever blast.

My Traynor amp has 4 6CA7's, and quite some time ago I rebuilt it as a 100W Marshall head. Yeah it kicks butt. I have to say I really like all my old tube guitar amps...even that particular smell inside them...

Darren

[Mannix]

Hey, this is weird!

Lots of guitar players here .or "would be" ones?
I started in electronics at 14 because my guitar amp blew up and i had to fix it..it seemed that i was better at fixing amps than playing!..it sure paid more!

right now i am better at playing than  TPU's but that can change!

Now here I am back with the tubes..a bit greyer,and another challenge that involves harmonics and music of sorts  Perhaps ...de ja vu?...

The weekend is here..any more players for the tube group?
the more that play in this band the better chance of getting some harmony..somewhere.
we will know it when we hear it.

there will be some terrible noise of course but that's just learning.

look around you for that old junk tv, cro, radio, its mostly all there

Lindsay