Recordings of a 2015 Dynavox VR-70E II tube amplifier (with upgraded tubes), a 2016 Marantz PM6005 amplifier and a 1975 Kenwood KR-4400 receiver.

This is a follow up of this video: [ Ссылка ]

You can download the uncompressed audio file here: [ Ссылка ]

The recordings were done with a Zoom H2 recorder, the speakers and Zoom were equally triangular spaced.
The WAV file with the music files was played using a Raspberry PI with HifiBerry DAC+ audio interface.
The Zoom recorder was set to a height of the middle of the speakers.
The amplifiers were set without any EQ and there was no editing done to the recorded files.

Please use some good headphones or monitor speakers to listen.
Because of the room acoustics, the recordings sound more lively than the original tracks and there is also some environmental noise.
Obviously, the recordings give an impression of the sound, as far as any of these type of recordings can do justice to the real sound.

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Specs:

Dynavox VR-70E II phono tube amplifier (2015)
with upgraded tubes:
power tubes: 2 matched pairs of Tung-Sol EL34B
pre amp and phase reverse tubes: 2 Philips 6U8A
2 x 37W RMS (8 OHM)
THD less than 1% S/N greater than 88 dB

Marantz PM6005 (2016)
2 x 45W RMS (8 OHM)
THD 0.08% S/N 102 dB

Kenwood KR-4400 (CA 1975)
2 x 25W RMS (8 OHM)
THD 0.5% S/N 90 dB

Q Acoustics 3050 speakers

Zoom H2 recorder

Featuring: a DIY Arduino VU meter: [ Ссылка ]

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Music:

#intro Voice Over Under (Kevin MacLeod - incompetech.com)
#1 Dat Step (YouTube)
#2 Boma Pa Siempre (YouTube)
#3 Eagle Rock (YouTube)
#4 Go Cart - Loop Mix (Kevin MacLeod - incompetech.com)
#5 Egmont Overture Finale (Kevin MacLeod - incompetech.com)

#intro, #4 and #5 by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
[ Ссылка ]

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