The Amp Garage

This has been covered before, but I'll offer it up: If you have a spare 5.0 VAC winding (or add a small transformer for five or six volts ac at an amp or so), build a simple voltage doubler, then regulate it back down to 6.0 VDC using a 7806 or similar chip, and you can enjoy the near silence DC fi...

I've been using 220K paralleled w/ 220pf for the volume pot doodad. Has anyone tried Ken's "Tone pot removal" trick? Removed by scraping the final 1/8" off the pot's carbon track. So when you roll full-up on the tone, she's-a-bypassed. It seems so simple and Spartan for such an improvement.YMMV I h...

If you are using a 1 ohm resistor this is not a problem, at least according to Randall Aiken to use a 1 ohm between 1 & 8 and take 1 to ground.

A couple of comments here. I like using 1/2W 1R resistors for this job. The 1/2W will do you the favor of acting like a fuse and blowing if a tube shorts or there's a bias failure. . True but I learned the hard way that some people will get pissed off if that resistor blows, they put a fresh set of...

ChrisM wrote:I am going to add a inline fuse... Would I want a 3A slo-blow?

I worked on a Candian Marshall that used in line fuses for the heaters
The resistance of the Slo Blow caused the fuse to get hot and unsolder itself from the PC board. Removed them and everything was fine.

I was just contemplating substituting a 100 ohm resistor in place of the standard 1 ohm. After reading this thread, I guess I was really going overboard. So, for setting the bias of a fixed/adjustable amp, is the 1 ohm resistor the chosen method for most of you guys? The 1% 1ohms are like 50 cents ...

Excuse me Bob, sorry for everyone I have insulted or offended with my inferior knowledge of amp building. Wow ask a question and get jumped on. I wasn't trying to "offend" anyone, just trying to get ideas for this, I come here with no knowledge of anything with this field. I have nothing but respec...

OK, Do these 1 ohm 1% biasing resistors need to be wire wound? When I was searching Mouser it didn't dawn on me until I saw Drz400's post with that number. Will Metal Film work or does it have to be wire wound for safety? They dont have to be wirewound, at 1ohm non of that is going to matter. It is...

I installed it this morning. First impressions is that I need to read the help file immediately. :oops: But it will be fun plugging in different values. Funny thing is when I plug my D'Lite values in it says I am exceeding a lot of things...... Whats up with that? What values? I would be surprised,...

What brand and tolerance do most of you guys use. Where do you buy them? Mouser? Got a part number? In my D'Lite I can't really make out the brand. When I was wrapping the leads around the test jack post I broke some of the ceramic material off around the lead. Do you think that would harm the resi...

Greetings! Just wondering about the margin of error when biasing using a 1ohm resistor. I have a bunch of 1ohm resistors, and it's difficult to get a reading of just how close to 1ohm they are on my DMM. Measuring them by themselves I always get readings in the region of 2.5ohms, which I guess is b...

But to be honest, I couldn't live with the noise floor, a SLO100 is producing in the Lead sound from Gain half open onwards. Larry But that's not heater noise, it's just noise period. :roll: I built a SLO Clone a few years ago. It's a really noisy design, I believe mostly because of the low biased ...

I guess what I'm getting at is for the casual amp builder who's tube theory is not very advanced, it wouldn't be a plug and play type program. I would think someone could make a program with a much more advanced GUI that would show a technician type amp guy what the different circuits look and soun...

I have Tube Cad, SE cad, and Audio Gadgets. I don't find them particularly easy to use, there are some labels that don't make much sense, and I haven't quite figured out what some of the power calculations are telling me. I certainly wouldn't bother to use it for guitar amp design, and I don't thin...

jaysg wrote:Do switching power supplies have mojo?

Absolutely not

They work fine for heaters but I would have reservations unless you could reproduce the impedance and sag. Also seems like a lot that can go wrong. First thing in a computer to fail always seems like the power supply.