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The original lamp is probably 12 volt. The circuit uses a series dropping resistor, something like 330 ohm 2W in series with the lamp. The voltage you measured is open circuit voltage. Once a good lamp is installed, the voltage drops to 12v. A LED conversion with resistor will work fine if you...

Copper wire used for coils like that is super soft. It had to be shipping vibrations.

I do not know about dynamics...I would guess that in reasonable use the audio is all small signal, so higher B+ makes no difference....except it is noisier, because noise is proportional to plate resistor value.

What I hear is a much more significant contribution from Jerry Garcia than this reviewer credits. If you listen to both If I Can... and Jefferson Starship's Blows Against the Empire you can track the Garcia production tidbits which make both records sound spectacular at times.

Bob, I consult for the Pipedreams company's owner. Small world. The Series III Pipes are quite good, but the successor company High Emotion Audio has something better. I could get you a sweet deal on a set....they'd sound great in your trailer.

Wow. Kansas location.

In my opinion, Polk never made a bad speaker.

Some 4066 applications are shunt to ground type rather than in signal path. I've always wondered if the distortions in a series design are lessened when the 4066 shunts a signal to ground.

My deck is the original Nakamichi 680, which is not just beautiful, but also takes the technology somewhere totally unexpected with 1/2 speed record and playback. Something about having a lawsuit halt its production makes the 680 almost dangerous to hold.

It would have been simpler to get rid of the too tight belt, which causes looping, and install a good belt. Increasing flywheel mass lowers the flutter frequencies due to belt stretch. I also bet he used an undersized supply flywheel to create back tension. Unfortunately, the deck alredy has...

It looks like it is kit built, and someone did a sucky job recapping. To cure the distortion, resolder the driver boards around the differential pair. I used one of these for years on Dahlquist DQ10s, and was very happy.

My puny humor attempt failed.....o_O

Agree that tubes are sexy? Anyone who has listened to different power amps knows that watts, for one, are not equal. Power measurements have got to be the best example of how tests can lead one astray.

Ha ha. Yesterday I wore earplugs at the sawmill. Almost anti-audiophile?

I have been preaching for years that audio tests do not correlate to good sound, but no one seems to agree. Years ago I grabbed a vacuum tube precision voltage source box from a university dumpster. The thing was loaded with OA2 and OA3 tubes. I tossed it, because I was looking for audio tubes...

IS that 3/4" plywood? Massive cabinets are keys to good performance. If you want to go next level, line the insides with lead foil (car stereo dampening sheets) Another tip, instead of poly fill, shred up wool sweaters from Goodwill.

Having heard a short list of battery operated units, I'd recommend going that route. LiPo batteries are cheap enough the pre could run for days between charges.

Words and pictures etched in the copper. He had a sense of humor!

I have a friend with a $2k record press machine. The duty cycle is about 18 hours per record...going slow and keeping the heat as low as possible are the keys to success.

My advice: quit whining! If a forum is owned by someone, they make the rules. Forums cost money once they reach a certain size. Pacific doesn't want his name out there, and that is his choice. (I got a nasty gram for using his real name in a thread) Like AK before, TH is being micro-managed...