This is where I'll put any files, photos, downloads, test measurements etc etc that don't logically go anywhere else.
This is the acoustic gramophone I've had in my loft for the past 20 years or so. Having had to clear out the loft and not having anywhere else to display it, I've given it to someone who can appreciate it further. I still think it's a beautiful object, so am still showing it here.
It was built around 1920, and has a Swiss Paillard turntable. There is no overall manufacturer's mark on it, or on the arm.
Note the three little boxes of needles. The green pyramid has "soft tone" needles in, whilst the little HMV boxes have "half-tone" needles.
The pick-up has ALBA written on it. The arm is beautifully pivoted, with no noticeable friction horizontally, and the vertical movement feels to be fluid (probably oil) damped. Very beautiful.
So, what does it sound like?
Here are two recordings made, with and without doors open. I thought that the doors would be just volume controls, but they act more like tone controls, reducing the horrible hf distortion when closed, albeit also reducing volume.
The song is Night and Day by Cole Porter, sung by the Comedy Harmonists.
The song is Guilty by Kahn, Akst, Whiting and sung by Steve Conway with Jack Byfield & his Orchestra.
Both records were rescued from the dump, so are of unknown condition, but were both cleaned with the RCM. They were played with the HMV needles, which have to be changed for each side played.
We have come a long way since 1920.
I measured the frequency responses of my cartridges using white noise from the HFS75 test record, but was suspicious of the results. I wasn't convinced that the white noise was really white, as the results I got didn't match the spec of the cartridges, the B&K sweeps supplied with the cartridge, nor some measurements made as part of past magazine reviews. In correspondance with Jim Lesurf, he suggested a new test record, from Analogue Productions, called "The Ultimate Analogue Test LP". Having obtained a copy, it seems to give results more consistent with my expectations. Instead of white noise, it uses a low-level (-20dB rel 5cm/sec) sweep which goes up to 20kHz.
The track was played and the output of the three turntables recorded using Cool Edit 2000, saved as a .WAV file, then analysed using the Right Mark Audio Analyser V 6.0
Note that the AT33ML is fitted to the AEG turntable and uses its own RIAA replay amps. The TSD15 is fitted to the EMT 948 turntable, and uses that turntable's RIAA replay amps. The Shure V15III feeds the Meridian 201 pre-amp's RIAA input. I have previously measured all three RIAA equalisers, and all are within 0.5dB of the correct RIAA response, subject to the IEC LF rolloff.
Here are the HF responses of my three main cartridges. The bass responses are all satisfactorily flat.
STYLUS PROFILE INFORMATION
VARIOUS CIRCUIT DIAGRAMS
LINSLEY-HOOD SIMPLE CLASS A AMPLIFIER
VARIOUS SOFTWARE & UTILITIES
Note: This is a Winrar compressed file.
Here is a paper outlining the audibility of jitter.
Here is a paper outlining the audibility of various Audio Codecs at different bit rates.
LISTENING ROOM LAYOUTS
I have now reverted to the previous layout with the B&W 801s. They worked considerably better well away from the walls, and we've moved the sitting area into what was the dining room.