The Amp Garage

If in doubt always ask and Martin did actually state it above already: ...The vacuum rectifier is backed up by silicon diodes, one in series with each anode, protecting against a short and increasing alowable anode voltage. When you see a cap there it is usually an idea from the HiFi crowd to stop ...

...now i,m confused, which is the correct way... High Voltage AC goes into the rectifier GZ34 on pin 4 and 6 5v AC heaters go to pin 2 and 8 Take the DC rectified off Pin 8 as outlined above by rdjones You are seeing the diodes mounted on the normally unused Pin 3 and 7 in that layout, from there t...

Here is a schematic for an old Silvertone amp I have. It uses a double voltage doubler...LOL. Two very low voltage secondaries doubled, then stacked together. Just ignore one of the secondaries and you will see how it was implemented. Hope this helps.

M Fowler wrote:Mark,

I have used everything from 245-0-245 to 300-0-300 on four EL84 Rocket builds with 4k3 and 5k2 OT. I prefer to run around 280-0-280 PT.

Mark

LOL @ all the Marks. What does a hair-lipped dog say??? Mark Mark Mark.. LOl J/K guys, one of my dads favorite jokes to raz me with.

After watching some clips on the net im considering a rocket build. I have a few things id like to make sure of before starting, One thing ive read is use a proven layout i assume the one in the TR files is proven? Turrets ok or are eylets recommended? I have 3 powertransformers i could use what is...

No worries I am not asking to humiliate you, but knowing what the cause of your amps symptoms could help someone else down the road. BTW I've made a few stupid mistakes myself on some builds and they were always the ones I learned the most on. Todd Originally I wired the bias circuit and the wires ...

It's not scolding Randy, it is just real common for people to hesitate to re-flow a solder joint that "looks good". Many times they fight looking for a larger problem when a few minutes spent re-flowing a few connections finally solves the problem. I will have to second the chance that a pot could b...

I patched in another transformer and to my dismay it too had the low volume very distorted sound, so I'm sure the OT is not my problem... Maybe I have a bad coupling cap that is throwing the bias of the next preamp stage off... I'm grasping at straws now... what else can I try? In your last thread ...

You might be correct, it is possible that the tubes need not be re-biased to switch them out. I personally check and re-set bias (if needed) whenever replacing power tubes, even if I replace them with the same model of tube. I don't know if it is always needed, but I feel better knowing for sure I a...

I'm looking at building a Trainwreck Express soon. I see the power transformer has 260-0-260 and 300-0-300 taps. Also, it can use 6V6 or EL34's! I'm wondering...what was in the original(s)? What is preferred?? I see on the schematics I've seen that the B+ is like 395, soo I'm thinking just use the ...

With all due respect Nick, I wasn't trying to start an argument. Just voicing my (political) opinion as you have several time though out this thread. Even after you apologized for bringing politics into the Gibson discussion on page one, you kept making remarks leaning so far right you almost fell o...

Obama and the bazooka wielding goons confiscated my floor. I will be looking for this article in the next "Enquirer". LOL. The haters are everywhere. Please leave the politics for your sleazy news page or your anti-Obama blogs. This is an amp page. Irony is everywhere. Hypocrisy seems to be making ...

Obama and the bazooka wielding goons confiscated my floor.

I will be looking for this article in the next "Enquirer".


LOL. The haters are everywhere. Please leave the politics for your sleazy news page or your anti-Obama blogs. This is an amp page.

Sometimes a bad or loose tube socket can cause this symptom. Have you tried to re-tension or clean the pin holders on the sockets? I have heard of this helping with intermittent crackling noises. Might not be the problem, but it is something easy to try first.

Good info Cliff. I'm not quite up to speed enough to understand it all, but I will save this and reference it when I get further. Please post the block diagrams and details on the system that your working on. Very interesting.