Tube Amp Archive

On the pic of the Dr Z, it shows a choke. What do I do about that?

Ok, but where do I get the schematic and layout?

Does anybody offer a Z-28 type kit that has two 6v6's and an EF-86 preamp section?

Im going to build a DR clone. I am just trying to figure out if I should get it in a head or combo. Considering available space and the expense, I would love to get the head and run it into my Greenback or 15 watt Bluedog. If I do this will it be a waste of time? I guess my question is how essential...

I am going to purchase a bias probe type device. I understand that these are used to match power tubes, but can the information they give be interpreted to show how much life is left in a tube?

Right , I understand that much. What Im curious about is are those measurements micromohs, mv. ma? Also, where can I find the information that says xx is good, xx is new?

When buying tubes, often the seller will say "these test at 76 where new is 70 and minimum is 40." What do those numbers represent and where can I find the information that tells me what is good and what is nos and what is minimum?

Thanks,
Jon

Ok, so how do I test pre amp and power tubes at the proper voltages?

Basically, what I want to do is be able to bias tubes, I can do that with a bias probe or Webers Bias Rite or a similar device. Ok, That I get, but I would also like to be able to test how much life is left in a pulled tube so I know it wont die on me 10 minutes after I get it home. Is there one dev...

Thats very cool, but it is way more complicated and expensive than I need. Has anyone built the one in Weber's book? Would it work for el84's with the test point on pin 3?

The DIY tube matcher described in Webers book is only able to test tubes like the 6v6, 6l6, el34 etc with the cathode on pin 8. If I want to build one to match el84's do I build the same rig but with the banana plugs and resistor on pin 3 since that is where the cathode is on the el84? Has anybody e...

I have been looking around at caps. The Mallory caps for the Express are around $20 each. There are other caps, made by quality manufacturers, ie Sprague, etc for $5-8. Is there any difference in tone or are they just used to be exactly like Ken?

I apologize. I was having a bad day and unfortunately, mcrracer caught the flak.

I feel badly about calling him a dickhead and offer my apologies. I know that kind of behavior is not acceptable here and it wont happen again.

Sorry to all,
Jon

I never said I knew anything about you, I simply said you should lighten up.
So lets see here, who lacks the attention to detail ?

Got it. I never use excel and didnt see the tabs at the bottom of the page.

Hey mcrracer, lighten up dickhead!!