Hi,
Selling my Neumann SMB2 valve phono stage with BV33 input transformers.
Little brother to the legendary Neumann WV2 phonostage, as used on their lathes, which typically go for 10K+.
In excellent cosmetic condition (see pics).
Been sitting in a box for over 10 years but tested it yesterday on my 301/fr64s/fr7f and worked perfectly with a really lovely beguiling sound.
Not many details available on the specs etc, but I’ve set out what i can find below.
Comes with female Tuchel connector, UK plug, 2 RCA input and and captive 1m with RCAs outputs.
Asking £2500. Cash-on-collection most welcome in Dublin, but can post at buyer’s risk and expense. Payment via bank transfer or paypal gift.
Cheers
Adrian
Background:
- Great vintage, German made phono equalizer in stereo valve-technology (2 x 12AX7 valves)
- It was used with the German made EMT 930st turntable and TSD15 pickup. Probably manufactured in the same period as the EMT, see: /oldriaa.html
- This is the version with the much sought after BV33 input transformers. Those BV33 transformers cost in Japan over $3500, see: AIRBOW>アクセサリー>トランス>BV33
- According to this description it was designed to be used with EMT turntables but works as separate unit as well.
- It has its own power supply with 2 x Siemens Selenium bridge-rectifiers of type B 250C50. Mains transformer can be changed to 110/120/240Volts primary 50/60Hz.
- Valvo condensers
- Tuchel 12 pin male connector on backside, female Tuchel connector included.
- BV33 SUT:
- Permalloy core with permalloy shielding.
- More details here: OTOMON Laboratory (音門ラボ) / Neumann BV-33 step up transformer for Ortofon, EMT, Denon cartridge * PERFECT Neumann BV33 stereo moving coil SUT | Reverb
- The BV33 MC transformer were produced by Haufe manufacture on behalf of Georg Neumann company in Berlin, and were used in the broadcast studio preamp/equalizer Neumann W2a, and as well in the little brother of the Neumann WV2 the SEV 1, an MC phono preamp/equalizer for general purpose application.
- This is very very rare step up transformer manufactured by Neumann, model BV-33, stepup ratio is 1:50, it can be matched with Ortofon SPU, Koetsu, EMT, Neumann DST-62 vv…
- Input impedance is 3~100ohm, output is 47K ohm. You can use it with all cartridges in market. Sound is perfect, deep , hot, wide range in middle, low and detail, natural sound in high frequency. Matching with both classical and Jazz.
- Technical data: - standard ratio 1 : 50 with open output (no loaded)
- actual ratio 1:40 with load resistor about 100 kOhm - as in the originally circuit of Neumann WV2 pre-amplifier
- actual ratio 1:30 with load resistor about 50 kOhm as standard in each M- phono equalizer preamplifier
- actual step-rate is 30 dB in case a operation with MM phono pre-amplifier, with 47-50 kOhm load/input resistance
- input DC resistance: 8 ohm Suitable for use with all cartridges with output impedance from 3 to 100 ohm - recommended for the low impedance cartridges with an output impedance about 3 to 40 Ohm - output DC resistance: 4,4 kOhm - output load resistance: 50 - 100 kOhm
