ZENER diode 5378 for GZ34 ?

[Colas LeGrippa]

I am missing 1n 4007 diodes, can I put zener like 5378 between HV a/c and GZ34 ?

Thanks

Colas

[sluckey]

I am missing 1n 4007 diodes, can I put zener like 5378 between HV a/c and GZ34 ?

Thanks

Colas

No. Just connect the PT leads directly to the tube socket.

[Colas LeGrippa]

many techs use diodes between PT and rectifier for some reasons i don't understand quite well , it is supposed to increase rectifiers life and keep them from arcing, but a rectifier is a rectifier, why rectifying ( and not recti-frying just like i wrote before hey hey ) the voltage before it is rectified by the so well called rectifier ?

Colas

[sluckey]

many techs use diodes between PT and rectifier

That's right. But none of them use a 100V zener.

[Colas LeGrippa]

good point. Now, is it better to use one like the 1n4007 or not at all, does it change the tone, does it change from a certain maner a recto amp to a SS one ?

[John]

For most amps, I think the 1N4007s are fine. Doug also sells heavier duty ones. Still cheap. The diodes protect your PT if the rectifier tube shorts out. No change in tone, because the rect. tube is still causing the sag and/or limiting the amount of available current.

At least, I think that's right.

[Willabe]

For most amps, I think the 1N4007s are fine. Doug also sells heavier duty ones. Still cheap. The diodes protect your PT if the rectifier tube shorts out. No change in tone, because the rect. tube is still causing the sag and/or limiting the amount of available current.

That's right about the PT protection and about the sag.

All the B+ current still has to pass through the rec. tube so you still get the same sag from that rec. tube in what ever amp it's in.


            Brad   

[tubeswell]

The fact that its the SS diode that's doing the rectifying doesn't matter in terms of the effect on the operation of the amp. A 1N4007 has a forward voltage drop of 0.6V, which is teensy compared to your average rectifier tube's forward voltage drop.

[kagliostro]

If the Tuber rectifier fails shorted, the presence of the in series diodes don't permit to AC to reach your circuit

K