Tube Amp Archive

Well, try it and just put the resistor in parallel with the standby switch. That will give you your B+ you want. For the test you won't have the standby switch. David, I understand what your saying but the sag the rect tube will induce, what 50 votls? This in series with the 20 volt drop on what he ...

He has even gone as far as using a mosfet to lift the cathodes.

What does KO opine about such a switch? KOC whole idea about this switch is that it takes the wear and tear off of the standby switch, therefore the switch will last longer. Thats basically it in a nutshell. I don't know about you but I have never replaced a standby switch because it was bad due to...

Allynmey,

How does it compare to the express?

Do you have a layout and schematic? I was looking into building an Express, but I think this would be better serving.

Very intersting indeed....

Bob

Aren't they the same that Heyboeurs that Moose has?

Isn't that a little steep?

yeah your right. I was looking at the schematic.

So, the two bleeder resistors and the first two 40uf caps are before the standby switch, then after is the 1k resistor and the CT.

If this is the way it is supposed to be then this is the way I will do it.

Thanks,

Bob

I was just wondering why... I thought maybe it was like that to keep B+ on the CT of the OT so when the standby switch was switched on it would stop from making a popping sound. I don't know, anyway, if Ken had it like that, which I was looking at Francesca's pics, and as far as I can see it is, the...

hmmm.... Why would you put a pair of caps and bleeder resistors before the standby switch? I never keep my bleed resistors in circuit anyway. I allways put them on the power switch. I first thought it was a mistake. You got my mind running on this one. I cannot figure out why you would want this... ...

I didn't go through the whole layout. I stopped after the fist few differences. The first few filter caps and the bleeder resisters are before the standby switch on the layout and the schematic they are after the standby switch. Granted, this probably won't make a diff in tone, but it was enough to ...

Hi all, This is my first post here. I have howver been lurking and reading up. I am looking at building an Express. Looks quite interesting. I got the schematic UR12 modified to be as the Francesca, but I don't see a layout. I found https://tubeamparchive.com/download/file.php?id=820 this one that R...