The Amp Garage

Same as Leo, warning is still there via chrome....

Bad filter caps, not enough decoupling, bad grounds, bad grounding methods, bad lead dress just to start...

I have that set at work shown from 2:30 to 7:30 in the video. Been too busy to play with it, being the principal engineer on 3 major projects takes all of my time. Check out this link for more:

http://www.motionmechanisms.com/

The circuit you linked from Frankleslie is using BTDR-1, and you are using BTDR-3, right? If so you should use the mono version in the Belton BTDR-3 application notes. Since you have a single 15V supply, the terminals marked Common should be supplied with Vcc/2 from a voltage divider from your 15V ...

Phil, it is a dual op amp, pins 1 2 3 and 5 6 7 are respective op amps. Pin 7 is the out. I'd probably strap a 100n film cap across pins 4 and 8. Make sure there is a dc blocking signal cap on the output pin 7.

1st stage of the TL072 is set up as a buffer. The second stage is set as an inverting amp with a gain of approx 7. With a gain of 7 it needs the 15 v rail for head room. Note the symmetrical pull up and pull down rails acting as a virtual earth centering the signal in between the +15v rail and groun...

My experince is that triode muddies the tone and feel of the amp. I've built a handful of 1/2 watt and 1 watt solid state amps that can still be too loud through efficient speakers. IMO, your best bet would be a good master and power scaling combination. Before going to triode, I'd suggest simply lo...

Chokes have inductance, resistors don't - in this context. Study R C and L C circuits and understand how L C circuits can reduce ripple.

See which one will give you the lowest voltage drop for a given current for the "same" amount of filtering.

Active tube controls have been around for a very long time. Playing with them some 20 years ago it was apparent that the bass could be over whelming easily. What signal level are you expecting to handle with your op amps? Expect to attenuate the signal 40 db or more depending on the amp / location a...

Hey Tony, I'm just throwing out food for thought. When I was active on the now defunct powerscaling.com forum, KOC always liked a healthy amount of screen resistance and he also talked about using a regulator to drop the screen voltage on SE EL84s about 30 v under the plate IIRC. Maybe you could rec...

I just wish LTSPICE had a bettet GUI. It is kind of a pain in the ass to use.

There are several fundamental differences between VVR and London Power's power scaling. London power allows you to maintain the rail voltages at the caps simplifying what is scaled. I"m in the scale the plates and screens, clamp the PI and pre voltages camp. This coupled with a good master volume su...

This is actally really cool, I guess asking for a beer delivery is rather simplistic:

https://youtu.be/mOBQXuu_5Zw

TUBEDUDE wrote:So many uses. Saw that crazy Russian that made a remote firing pistol on a drone, a guy fishing with a drone, what's next?

I'd like one to bring me a cold beer when I'm floating around in the middle of the lake...

In Dana's defense, I'm sure providing support to all of the problems that come along with uneducated installs, could be overwhelming to say the least.