tubes 4 hifi
 "the path of least resistance is through a vacuum"

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PREMIERE TUBE PREAMPS

assembled & tested, ready to plug & play

SP9 preamp

SP12 preamp

SP13 preamp

SP14 preamp

PH-12 phono

PH-14 phono

PH-16 phono


due to moving and relocating, not taking orders until mid-July, check back !

 

for KIT versions of these preamps, click here


here's an excellent unbiased review and discussion of a couple of our preamps . . . .


returns and refunds policy

SP9 preamp

this is a 4 tube line amplifier plus tube power supply and high quality TONE CONTROLS !!
If you need a phono preamp you can add our PH-12 phono circuit
Note - these photos also show the optional PH12 phono section added inside.

 

complete SP9 preamp kit with 12" chassis (for use withOUT phono),
assembled preamp including tubes, ready to plug and play, $1090 plus $40 shipping in USA
 
complete SP9 preamp kit with 16" chassis (with room to add phono)
assembled preamp including tubes, ready to plug and play, $1110 plus $40 shipping in USA
 

SP12 preamp

this is our most popular preamp, and probably the best value for your $$$.
Standard version in 12" or 16" chassis, If you need a phono preamp you can add our PH-12 phono circuit into the larger 16" chassis.

The SE upgrade is a popular option with the 16" chassis, includes 21 step master volume attenuator and dual mono gain/balance step attenuators,
instead of conventional volume and balance controls; We supply better quality ECC802 or mil-spec 6189W tubes



one of our customers posted this review on AudioAsylum here http://www.audioasylum.com/forums/amp/messages/16/166938.html

and here are some additional photos of a custom SP12 build I did for a customer, with some followup comments.

SP12 preamp in 12" chassis (for use withOUT phono)
with conventional volume & balance controls,
$1080 plus $40 shipping in USA.  
SP12 preamp in 16" chassis (with room to add phono)
with conventional volume & balance controls, $1100 plus $40 shipping in USA.  
SP12-SE preamp in 16" chassis (with room to add phono)
with triple attenuators
(21 step volume and dual gain/balance) $1120 plus $40 shipping in USA.  


SP13 preamp

this is our newest preamp design, a smaller version of our very best SP14 using smaller 6CG7/6FQ7 tubes.
Same essential circuit design as our SP12 but with many improvements. this has dual mono regulated power supplies for each channel, for both B+ and filaments.
STANDARD items include 21 step volume attenuator and dual mono gain/balance attenuators, iso-damping chassis, iso-mounts for the circuit board, and more.
NOTE: For phono use with this preamp, you'll need to add a separate phono preamp such as our premium PH14 or PH16 phono preamp below.

SP13 preamp in 16" chassis with triple attenuators
(21 step volume and dual gain/balance) $1325 plus $40 shipping in USA.  


SP14 preamp

this is our very best preamp, using larger 6SN7 octal tubes, in a larger 5" tall chassis.
Same circuit circuit design as our SP13 but on a much larger PCB, with NO room to add a phono section inside.
NOTE: For phono use with this preamp, you'll need to add a separate phono preamp such as our premium PH14 or PH16 phono preamp below.
This preamp has dual mono regulated power supplies for each channel, for both B+ and filaments.
STANDARD items include 21 step volume attenuator and dual mono gain/balance attenuators, iso-damping chassis, iso-mounts for the circuit board, and more.


.

SP14 preamp in 16" chassis 5" height
(21 step volume and dual gain/balance) $1350 plus $40 shippingin USA.  


PH-12 phono preamp

add-in phono only preamp using a JFET (10x less noise than a tube) as a current source in cascode with 6922 tube gain stage
for super low-noise cascode front end followed by passive RIAA EQ, and buffered output; followed by another 6922 output buffer;
gain is adjustable from 40db to 45db with a jumper.
The PH12 is an ADD-ON option for SP9 and SP12 preamps ONLY. It does NOT have an output buffer and it does NOT have a power supply.
PH12 phono circuit add-in for SP9 or SP12 for $240  

PH-14 premium phono preamp

This has a full power supply using tube rectification, with HV regulator and filament regulator.
This circuit has a 12AU7 tube buffered output for lower impedance, better drive capability, and enhanced and perfected RIAA EQ.
new version coming fall 2018


PH-16 premium phono preamp

This is our very best phono preamp, this is a phono only separate preamp, and INCLUDES premium grade resistors and capacitor.
premium grade phono only preamp using a JFET (10x less noise than a tube) as a current source in cascode with 6922 tube gain stage
for super low-noise cascode front end followed by passive RIAA EQ, followed by another 6922 gain stage, followed by an AIKIDO output buffer with two 6922 tubes.;
gain is 45db use with MM cartridges or medium to high output MC cartridges.

PH-16 phono preamp in 16" wide chassis
assembled, tested, ready to plug and play for $895 plus $40 shipping in USA  

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 tubes 4 hifi
 "the path of least resistance is through a vacuum"