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The tweeter may be swapped easily. Tweeter terminals are plug in connectors. Crossover caps cannot cause "spitting" , only treble attenuation (horns are the exception). Ferrofluid gets thick with time causing treble attenuation, but not spitting, however it would be good to know if the spitting...

What model? The first step is to play a pre-recorded music cassette and switch your monitor between stereo and mono. If there is little difference, then you have some sort of record problem. If you hear a big difference, then the head azimuth needs to be set using a test tape. Is this a 3 head...

Since the schematic shows a regulated power supply, I'd forget the resistors, and change C10 from 470 @16v to 470 @25v, change C14 to 220uf @ 25v, add a 10 ohm resistor in series with R10, and add a 16v 1 watt zener in parallel with C14. The change will give you a real regulated supply rather...

The 6GH8A tubes I have new are GE and Sylvania. I have used RCAs among many others. If the RCA structure is what you want I can look at the other brands and see if I find a match

To open a thermal fuse in a transformer, current must flow for a considerable amount of time - 10 minutes at least. The problem is all this excess power had to have broken down other parts in the deck. If he is lucky, the broken parts will be the main filter capacitors before the regulators. I...

Built the Leach preamp from an article in Audio magazine.

Bob and I fiddled around with stereos with a group of audiophiles around 1975-77. One project we worked on was a hand made true class A power amp that put out 5 watts of amazing sound for about a week (then you needed new output transistors. and you were good for another week) Bob later...

I've never heard the system at Bob's house, but he has told me the loooong story of how he went from modifying various Beveridges to finally starting over. The resonance issues cited by Sony is a real issue because the THD from an electrostat is so darn low that nothing is masked. I've...

I'll check for RCA brand....I should have plenty. Most 7199 tubes were RCA by the way.

So my old friend and mentor Bob Hoover has produced the rarest electrostat that real people can buy. http://superlativeaudio.com/

Mr Rye I have plenty of NOS 6GH8 american tubes for sale. Any brand preferences? To use them in place of the 7199 you may actually rewire the original driver board.

Remove the front, remove the 4 screws securing the beters, then pop open the clear meter housing. Use a small flat blade screwdriver to lift the front meter bracket (shiny silver). You will see when you've stretched the bracket enough to free the meter. I just had to do one. A little movement...

I'm without a shop but I still work in my secret underground lab. There is still room for you, although the lack of good heat (basement) makes visiting a bit rough. And I am much more productive in 1/2 the time. I'll finish a Nak 670ZX this week and maybe finish a Dragon before Christmas.

Looks like something out of a broadcast console.

The GAS Sleeping Beauty was one of many early classic moving coils which got pushed aside once koetsu hit the market. At that time everyone used transformers. At some point Absolute Sound hooked an MC to a MM phono stage (SP-6C) without the transformer, and the rest was history.

I am I. I have about 5,000 manuals to sell...just the good audio stuff saved from the dumpster. In May alone I cleared out 8 4 drawer file cabinets, gave away all my portable and car audio manuals, but trashed the rest. I'm not taking new work but if you have a sticky meter, and it isn't from a...

I've been selling my paper manuals for months now on ebay. PM me or post here if you need anything. I'm also interested in bulk sales.

On some transistors (made with Germanium) and diodes in early 1960's stereos, the forward voltage will read about 270 instead of 650. It is also normal to read some very high values instead of "OL" whne reverse biased, as germaniums are generally leaky.

Bob, also consider a Yamaha C-85 preamp. I had to repair one of those Parasounds; what a nightmare. Yes, Curl designed it, but the mechanics were 100% Taiwan garbage. Really poor boar layout too.

Hakko baby! 936