Bottlehead Reduction (With Integration upgrade and others) Phono Pre-amp.
ALL212
Posts: 1,577
Bottlehead Reduction: (http://bottlehead.com/?product=reduction-phono-preamplifier-kit)
6DJ8/6922/7308 tube based Phono Pre-Amp. One tube per channel.
Gain of approximately 36 dB at 1 kHz and is intended for use with phono cartridges of 2.5mV and higher output, with 5mV output being the design center. Higher than 5mV output is certainly fine, and one may also use lower output cartridges with a suitable step up device.
Input impedance is 47.5K ohms, input capacitance is 50pF. Remember that your phono cable’s capacitance will add to this figure and increase your cartridge’s capacitive load somewhat.
Frequency response exhibits +/- 0.3dB RIAA curve accuracy.
The Reduction is designed to operate into line stages with 50K or higher input impedance through interconnects of 1M or shorter length. At 4.5mV input THD is 0.12%, THD+noise is 0.6%
Integration Upgrade: (http://bottlehead.com/?product=integration-upgrade-for-reduction-phono-preamp)
Four Camille Cascode Constant Current Sources (C4S) replace the stock plate load resistors, dramatically increasing the load impedance for approximately 60dB better Power Supply Ripple Rejection (PSRR) and the extraction of the full gain available from the tubes (up from about 36dB to about 40dB).
The addition of a Zener shunt voltage regulator lowers the power supply impedance yielding a sense of increased extension of both bass and treble.
Upgrades BEYOND:
Power supply caps are all Nichicon PW and last two are tipped with film capacitors (one Solen 3.3uf, one ClarityCap PX 1 uf).
Added high speed Cree diode.
Heater filter cap is Nichicon Fine Gold with ClarityCap PX 1uf.
All wiring not heater related is cotton wrapped PVC over copper.
Heater wiring is shielded Mogami W2534.
RCA input/output connectors are Vampire Wire CM1F/CB
Cardas Grounding Post
Output and RIAA curve capacitors are Sonicap Gen I
All wirewound resistors replaced with Mills resistors
Tubes supplied will be two pair of PC88 tubes. These have 7v heaters instead of 6 but work just fine. Because they are "underfed" they will not last as long as if they were on 7v but take 20% off of 10000 hours....they'll last long enough for you to find what you like. One pair are Tesla yellow label, the other are Valvo military (have the hawk symbol on them). Valvo are in original boxes.
Selling as I’ve built the Eros tube Pre and no longer require this. Will NOT come with the Bottlehead logo badge.
Asking $650 before shipping arrangements are made. I will drive a reasonable amount for pickup. Paypal gift or discussed payment ahead of purchase.
6DJ8/6922/7308 tube based Phono Pre-Amp. One tube per channel.
Gain of approximately 36 dB at 1 kHz and is intended for use with phono cartridges of 2.5mV and higher output, with 5mV output being the design center. Higher than 5mV output is certainly fine, and one may also use lower output cartridges with a suitable step up device.
Input impedance is 47.5K ohms, input capacitance is 50pF. Remember that your phono cable’s capacitance will add to this figure and increase your cartridge’s capacitive load somewhat.
Frequency response exhibits +/- 0.3dB RIAA curve accuracy.
The Reduction is designed to operate into line stages with 50K or higher input impedance through interconnects of 1M or shorter length. At 4.5mV input THD is 0.12%, THD+noise is 0.6%
Integration Upgrade: (http://bottlehead.com/?product=integration-upgrade-for-reduction-phono-preamp)
Four Camille Cascode Constant Current Sources (C4S) replace the stock plate load resistors, dramatically increasing the load impedance for approximately 60dB better Power Supply Ripple Rejection (PSRR) and the extraction of the full gain available from the tubes (up from about 36dB to about 40dB).
The addition of a Zener shunt voltage regulator lowers the power supply impedance yielding a sense of increased extension of both bass and treble.
Upgrades BEYOND:
Power supply caps are all Nichicon PW and last two are tipped with film capacitors (one Solen 3.3uf, one ClarityCap PX 1 uf).
Added high speed Cree diode.
Heater filter cap is Nichicon Fine Gold with ClarityCap PX 1uf.
All wiring not heater related is cotton wrapped PVC over copper.
Heater wiring is shielded Mogami W2534.
RCA input/output connectors are Vampire Wire CM1F/CB
Cardas Grounding Post
Output and RIAA curve capacitors are Sonicap Gen I
All wirewound resistors replaced with Mills resistors
Tubes supplied will be two pair of PC88 tubes. These have 7v heaters instead of 6 but work just fine. Because they are "underfed" they will not last as long as if they were on 7v but take 20% off of 10000 hours....they'll last long enough for you to find what you like. One pair are Tesla yellow label, the other are Valvo military (have the hawk symbol on them). Valvo are in original boxes.
Selling as I’ve built the Eros tube Pre and no longer require this. Will NOT come with the Bottlehead logo badge.
Asking $650 before shipping arrangements are made. I will drive a reasonable amount for pickup. Paypal gift or discussed payment ahead of purchase.
Aaron
Enabler Extraordinaire
Enabler Extraordinaire
Post edited by ALL212 on
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$625 and FREE shipping. Now on the 'bay and 'AgonAaron
Enabler Extraordinaire -
Oh.... you guys...
$550 but you pay shipping.
You can't buy the kit and put the premium parts in it for this price.Aaron
Enabler Extraordinaire -
$525 and you're on for shipping.
This is the last drop in price.Aaron
Enabler Extraordinaire -
I lied... This thing needs a home.
I'm open for reasonable offers. Just keep in mind this kit goes for $538 without the upgrades and still in pieces at that price.
I'm not open to unreasonable offers so be nice...
Aaron
Enabler Extraordinaire -
If nothing else I'm going to be obnoxious enough that someone will buy this just to shut me up!
Anyone need a phone pre amp that will kick sub $1000 pre's for $500?
Anyone even have a turntable around here anymore?!!
Aaron
Enabler Extraordinaire -
