Blueprinted Custom Guitar/Hi-Fi Monoblock Baldwin Tube Amplifier & Dynaco Pre

Description

From my friend, the retired studio technician, we are proud to offer another of his fine Custom Build Vintage American Tube Amplifiers -- he is a meticulous and extremely knowledgeable gentleman whose arthritis precludes more than a few builds yearly, and we have placed 5 or 6 of his amps with some very satisfied customers. He is darn good; after 3 other techs tried to solve a red-plating power tube problem in a 1965 Fender Deluxe Reverb guitar amplifier, he fixed it! We all wish he were able to work regularly! == Couple of Notes: He said the power tubes are matched for performance, and obviously aren't exactly the same size bottles -- and, of course, this chassis had no bottom plate originally, and he added a simple but elegant frosted plexi with wood rails, and feet as shown == 3 prong grounded power cord == Includes written pages shown, and we'll email you the text from the listing when sold == We ship worldwide, and are quite experienced in packing vintage amps -- it is heavy, and we would need to box and ship the power amp and the pre-amp (with power amp tubes) separately ==
Here is his description:
For the audiophile or audio archivist as well as the professional live or recording studio musician, I am selling a unique combination of classic American made 1950s components. These are first a blueprinted Baldwin Model PC all tube point to point wired 40 watt power monoblock amplifier featuring dual push pull cathode biased 6L6 pentodes with massive power supply with huge inductor LRC filtered design and twin paralleled 5U4 rectifiers, plus an early European Philips 12AX7 dual triode driver phase inverter. The remaining tube compliment is four American RCA coke bottle 6L6Gs and two US Sylvania black plate 5U4s. These provide true HiFi audio bandwidth and linearity into either 8 or 16 ohm impedance loudspeakers. The matched first generation Dynaco PAM1 preamplifier, which is powered by the power amp utilizes two vintage European ECC83 12AX7 dual triodes with DC heaters, cathode follower output and pure single ended class A circuitry. For the glass audio collector or music archivist demanding absolute lab grade playback of early transcription LPs, 78s, and later RIAA equalized vinyl records the combination of three selectable phono EQs plus two selectable phono gain stages accepting any moving magnet and many moving coil cartridges with two line inputs and tube buffered record out and tape playback capability is exceptional. For the studio or stage guitarist the very high gain microphone instrument input delivers huge linear clean channel tube performance with instant provision for any rack or individual effects addition using the tube buffered EFX loop. For any music ranging from listening to the subtle nuance of classic Jazz played back through a Klipsch Tannoy or EV corner horn systems to screaming rock guitar leads driving alnico Marshall or Fender cabs this may be an ideal solution. For the serious potential buyer I will be glad to E-mail much more complete circuitry and performance information. Not for the faint of heart and certainly not for the amateur ==
1950s Baldwin Model  tube amplifier specifications:
Push pull class A/B1 circuit design using four 6L6 type pentodes which
are cathode biased with 485 volts DC on the plates.
Driver/phase inverter is a 12 AX7/ECC83 dual triode.
Power supply is true LRC type, tightly regulated with massive
inductive capacitive filtering using a massive inductor and dual
paralleled 5U4 rectifier tubes.
Input jack provided is BNC with supplied RCA type phono jack adapter.
Output is triple three way binding post terminals with provision for
direct connection of 8 or 16 ohm impedance loudspeakers. A grounded
power cord has been added for safety and noise concerns, with vintage
toggle power swithing.
The amp has an external fuse block, and an octal female connector for
suppling 300 volts DC to the remote preamplifier as well as 6.3 volts
AC to supply heater voltage to the DC rectifier /filter supply used
for the preamp tube heaters.
The amplifier has been blueprinted and extensively bench tested to
easily exceed the original 40 watt RMS continous output power. The amp
has very linear output of 90% this rating from below 10 HZ to beyond
45KHZ into both 8 and 16 ohm loads with good dampening and very low
overall noise floor.
For the audiophile/collector, musicision, or studio purest, all
internal components are selected 1950s American types including all
filter and circuit capacitors, and all circuit resistors. Point to
point wiring is used throughout, with such refinements ans oversize
ceramic power resistors for voltage dropping and cathode bias
resistors, which are standoff chassis mounted for rugged long term
stability.
The supplied tube compliment is four strong, well matched vintage
American RCA large coke bottle 6l6s, two black plate American Sylvania
5U4s, and a carefully selected vintage European Philips ECC83/12 AX7.
The input circuitry utilizing the dual triode voltage amplifier and
phase inverter is relatively voltage hungry, requiring 2 volts RMS
(+3db) to drive the amplifier to full output, therfore in this
application the onboard master gain potentiometer should be left in
the fully clockwise position.
First generation 1950s Dynaco PAM-1 monophonic preamplifier specifications:
Pure class A triode circuitry deaign using two ECC83/12AX7 dual triodes.
Classic high plate voltage/ high gain circuit topography, with low
noise DC heater supplys, and versatile input and gain options.
Audio output is a cathode follower design, allowing the preamp to
provide a low impedence source for the power amplifier.
Power is supplied (via the attached umbilicle cable with Octal plug
termination) to the internal filtered DC voltage for all circuitry,
from the power amplifier, as well as the 6.3 volts AC which is
rectified using a Selenium rectifier and voltage doubler circuit, with
massive filtering to provide the 11 volts DC required by the series
wired dual heaters of each 12AX7.
The Octal plug cable wiring uses the same pinout for connection as the
original Dynaco design. Therefore the preamplifier, if desired, can be
used independantly from the power amp, with power supply connection
made to Dynaco power amps such as the Mark II, or by using an original
Dynaco PS-1  power supply made for use with this model preamplifier.
All circuit components are selected 1950s American types including all
resistors and capacitors.
The preamp provides a choice of three lab grade equalization playback
curves for phono reproduction and transcription, including standard
78, early LP, and later RIAA LP and 45. Two Phono stage are provided,
first is a normal gain stage for use with most vintage or modern
Moving Magnet mono cartridges, and the second ia a very high gain
(58db) stage which allow use of lower output cartridges including many
higer output Moving coil designs to good effect.
Two separate line level inputs are provided with 20 db gain allowing
input from any normal traditional device such and open reel, recording
and stage consoles, and CD players, plus enough gain for signal from
puny modern CMOS sources such as portable devices and DVD/CD players.
The highest gain circuitry is the microphone/guitar/instrument stage
(with provided Switchcraft 1/4" input jack) which like the line stages
provides an incredible 8 hz to 60 khz liner response, when the tone
controls are at center flat response positions. The circuit layout,
component selection, and DC heaters result in extremely low overall
noise floor, from the carefully selected vintage European Philips and
Arcturus ECC83s installed.
A front panel selectable ( pre tone control ) flat response, tape loop
is provided for fully tube buffered recording out and playback
monitoring when used for transcription in a home or professional
studio environment. This same circuitry can be used equally well for
an effects loop when used in stage or recording venues, when the
system is utilized as lead guitar, harp, or keyboard amplification.
The separate bass and treble tone controls can be effectively used for
loudspeaker/room acoustic responase defeciencies, touch up of vintage
shellac and vinyl response abberations, and very importantly, huge
tonal control for guitar applications, with over +/- 14 DB boost and
cut for both.
For anyone not intimidated by the 22 inch wide, 45 lb dimensions of
this open chassis amplifier, This is a very cool, exceptionally good
sounding system equally at home aside (or atop) a golden age Klipsh,
JBL, Altec, or Tannoy corner horn, as it would be driving a 60s
Marshall 4X12 Celestion loaded lead Cab.
== We Ship Worldwide! ==
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NO PARTIAL REFUNDS - We have a return policy
Texas residents pay sales tax – the governor gets it, not us !!
Blue Book condition grades: Mint 98%, EXC+
95%, EXC
90%, VG+ 80%, VG 70%, Good 60%, Fair 40%