is there a dual diode tube that runs off a 9v battery? - anyone?

[paggerman]

Battery powered dual diode valve

Hi Defaced, I pulled apart a Nippergram radio/record player the other day and in it was a 6X4. This is a full wave rectifier, which in my dangerously under-educated mind means two diodes. From the datasheet: 'For use in compact ac or auto receivers where the average current is not in excess of 70ma'.

[guitician]

6x4 is a common cathode dual diode.

HTH... I was thinking your still using battery power.

And while I was into clipper circuits I found that to simulate "Gain", your ratio of diode threshold to peak input should be as great as possible. This allows the signal to remain clipped longer as the note decays.

[HTH]

well, it works now, but sounds shit - HARD clipping like Steve O'Connor reported in his experiments.

more work needed on this one I think.

[J M Fahey]

Yes, hard clipping. Fact is , "tube sound/clipping" which we want to emulate, does not come from any diode action within the tube per se, but from a very complex interaction of plate-approaching-cathode-voltage + gate-cathode diode conduction + screen voltage going down (if we have a screen) + gain compression because of transconductance shifting + internal resistance shifting + probably a host other factors I fail to see but which are doubtlessly there.
Compared to that, diode clipping is boring (no news around here) and tube diodes are not much more than funky diodes, certainly with different threshold and curve slopes, but nothing to write home about.
Of course, slamming an orange glowing filament within an otherwise SS amplifier doubles or triples its marketability.
F*nd*r had the chutzpah enough to slam a dual diode connected (grids tied to plates) 12AX7 into the Performer and Rock-something series and call them "Tube Preamps".
Funny things is they used so-called "black tubes", 12AX7 shrink-wrapped, soldered to PCB pads (no sockets). They were "eternal" for all practical purposes and obviously it was a way to somehow use microphonic/hissy/way out of spec "junk" tubes. Oh well.