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Actually someone on this group had a similar thing going, and did put the LED on. It looked great. I want one.... lol...

Thanks Darwin, RetiredUnit1 retired from programmer career in a manufacturing/distribution environment, part of which was security. I read *everything*! I'm using uBlock origin for ad-blocking, works great!

Added.... 🤟 :cool:(y)

I cut my amp building teeth on a 5e3 with MM transformers with a SDG kit (defunct now). fwiw, I don't think the higher price is worth it compared to heyboer. I have purchased almost 100 MM transformers and chokes but they have just gone ridiculously high priced. And I'm only a few miles from...

Standard Hiwatt DR103 (100w) or DR504 (50w) don't overdrive. There is no preamp or power tube distortion, and they sound the same from 1/2w to 100w. Although at highest volume you will get speaker breakup, unless you have very high rated speakers. Now if you build a Marshall 2203...... You...

I found this out the hard way on my first amp, a 5e3. BUZZZZZZZ GRIIIIIIIIINNNNDDDDD HUMMMMMM My first and only kit came with the instructions for a star ground. But what it didn't have was the ORDER you put the different grounds on the star. I had done the power caps and output transformer...

Basics first. Is the fuse blown? It may have broken from vibration, and that's why it would go on and off, and now doesn't power up.

I have yet to build a EL84 amp. I have all the parts for this, all phillips mustard caps..... soon.... maybe next year actually.... edited: oops, put the indicator on the wrong side of the switch. lmao.....

I built six DR504's back in 2008, Mercury Magnetics transformers, 100% repro chassis from a company no longer in business. Used the Mark Huss layout. One is my main amp, and I used to use the other two for PA monoblocks (in storage now), two were sold and one was traded for a custom guitar...

The great part about them is they sound the same a 1/4w as they do full volume -- if the speakers can take it without distorting.....

The have the Hiwatt 50 and 100 now, not just Marshall.

Beautiful! Well done. My helper demonstrating my Sprague Tel-Ohmike T0-6A capacitor analyzer - she's about the same age, lol.... The TI calculator is from the early 70's, a veritable child in comparison..... and it still works.

Ok! I thought it would probably be with the output transformer, but I was so brain dead today. Ugh..... Izzy is 23, that's 161 years old in Human years. He's almost completely deaf, can barely see, but boy is he loud when he wants out which is just about every morning before sunrise. I...

Here ya go...

I couldn't tell if they were touching either. I usually take insulation off of another wire and slip it over the legs on those pot to pot caps and resistors.... Then I got tired of wasting wire so I bought some empty PTFE insulation, was kinda surprised they actually make such a thing.

And those wires are running parallel, all wires are supposed to intersect as close to a 180 degree angle as possible, which is why you see curly-que wire dressing on old fenders. High voltage will just induct into the next wire if they are close and parallel.....

As I was cooking my steak and potatoes (delicious btw, but that's a different thread) I thought about the NFB. The resistor value is calculated for a specific output ohms. So you have to use a different resistor if you're using 4 ohm for the secondary instead of 8 ohm. I looked up the...

This is the NFB circuit. The 22k is the NFB resistor, I forget what the 1.5k is called. This from Rob Robinette's site about positive feedback, which I have never personally witnessed but have seen online more than a few times "Since this amp uses negative feedback (NFB) there is a 50-50...

Am I not seeing this resistor 'cus it's hidden, or is the 22k resistor for the preamp power missing?

Hey, that's a great looking build. Those 5W cathode resisters get HOT and will fry capacitors that touch them. It would be prudent to have at least a Popsicle stick thickness in between it and the capacitor! I usually leave as much room as I can, but there's not a lot of room to play with on...