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Noise is generally NOT limited to transistors, and heat usually makes noise worse, not better. Resistors and capacitors (rarely) can cause noise. Make a nozzle on your heat source and carefully narrow the heated air to identify a smaller number of parts which seem noisy. The DH101 suffers badly...

Capacitor tolerance has no effect on sound qualities, unless they are in an equalization circuit. Power supply capacitors, coupling, and bypass capacitors have modes of distortion related to their physical design. Inside electrolytic capacitors are two parallel foil "plates" separted by a semi...

I am not worthy Nav. Nando, thanks for your insight.

Air cores do not saturate at high power levels = lower distortion. If you have an inductance meter, you could unwrap a 1uH coil. Removing 1 wrap to solder the original coil in will not cause problems, because all the parts are 5-10% anyway.

Paint the LEDs black- effective and reversable low tech solution.

My list is: Sansui 2000X NAD 7120 HK 330C or 430 Sherwood S-2620CP Onkyo TX-2500

The Sound Tech 1000A was the standard for audio manufaturers. Current used pricing is $500. It really shines if you are working on older tuneable IF stages (ala Marantz 10B and vinyage tube McIntosh). The 1000A had an option (003 IIRC) which lowered THD to 0.05%. Option 001 was a switchable...

My friendly record store has an expensive machine using this technology. You absolutely must keep the temperature as low as possible. The big issue is a cycle takes about 4 hours. His expensive machine can do 2 records at once with rice paper between them. Both top and bottom are heated in his...

Always play music and listen to your deck before, during, and after testing. A drop out problem like the OP describes is easily tracked down by playing music. If the music plays fine, then it is the test set up. Azimuth is easily judged by putting your monitor amp into MONO (you need...

OK, but 70 is old. My wife threw a surprise party last night and it was great. She went through my phone contacts and invited friends of mine she had never met. Bob, she would have invited you but she stuck with 615 area codes! A friend last night told a story about his father's wisdom...

I do not have a stylus microscope, but I gave mine to Turntable Medic in Murfreesboro. There are different test records, some of which are designed by Shure specifically for the cartridge analyzer. Shere and others also made "tracking performance" test records. These you could use by ear. The...

Way back on page one someone asked about DAT audio quality. The principal sampling rate of 48kHz seems o close to 44.1kHz (an optional rate for all DATs) that the sound ought to be the same, but to my ears, it isn't. Now I can't claim I know whether it is sampling rate alone, better...

I have some of the CBS test records if anyone wants to fiddle with an analyzer.

I have no 6112 tubes.

If Perry does not, I'm pretty sure I have many 6112s. 6550 and KT88 are different tubes. I have used quads of 6550s. I think I might have 2 7308s. Perry gets first offer since this is his thread.

The tape has hissy music recorded on one side. Next..... Are we being invaded by mis-spellers?

Pioneer DVD players across the board make great sounding CD players. One sleeper is the DV-45. Also, if you want some real fun, play a CD on an old laserdisc player like the CLD-3070. Your Denon uses a Sony pickup, so you can get it going fairly easily.

Take laxatives the day before the prep day. Also, the pills are better than the drink.

A very realistic recording which became a favorite demo record back in the days of Linn vs. Sota truntable debates. This record probably stimulated Linn's "toe tapping" argument for the superiority of the Sondek.

What is the repair history for failures in the differential/ current mirror/pre-driver stages? I read between the lines that some customers put thru hole parts in the wrong positions, but given a proper build, how often do you see failures in the portions which may become SMD? I kinda see the...