Interesting schematics with possibilities for valve effects

[DryRoasted]

A month or two ago I picked up a couple of old radio repair books from a car boot sale and kinda put them on the shelf, but looking through them today I found a remarkably familiar schematic and another one involving the use of a transformer to boost the voltage going to the second half of the tube.  I've scanned in two of the pages but I can scan more if people are interested.  (the books are from the 40's so I dont think any copyright issues should manifest themselves)




The circuits are based on what was standard radio voltages but I hope to have a play with the second circuit and see what happens.   Of course I'll need an AC powersupply cos transformers dont run on DC!

[theehman]

The transformer is boosting the signal, not the applied voltage.  A DC power supply is fine.  This was a common method of coupling stages together in the early tube years.

[kurtlives]

They didn't RC coupling in the early days correct? That is why they used the transformer...

[DryRoasted]

Thanks for the correction EH, that makes me a bit more eager to try it.  Kurt, I think the first circuit refers to resistance-capacitance coupling

[rocket]

The transformer is boosting the signal, not the applied voltage.  A DC power supply is fine.  This was a common method of coupling stages together in the early tube years.

And if you replace the 2nd tube with speaker, it is what happens in a single ended tube amp.