Preamp kits
Please note:
For multiple items ordered, shipping fees will add up. However we will refund excess shipping to you as soon as we have received your order.
ALL our kits require assembly! Tubes are NOT included!
All the resistors and capacitors are mixed together, they are not packed in their individual values and/or types.
With the exception of our clone kit#1, with all other kits, the volume control should be 100K and the balance control should be 250K
Shipping costs are for the lower 48 only. For all other areas, please contact us for shipping costs
Kit #1: Dynaco clone PC5 & PC6
This is our basic clone kit. The circuit and PCB layout are almost identical to the original Dynaco PC5 and PC6, but we have made some slight changes to the RIAA component values on the PC6 phono preamp to make it a b it more compatible with modern MM cartridges. Both preamps use two 12AX7 triodes each.
Other than that, both the PC5 and PC6 are a direct drop in with all of the same connections as the original Dynaco PC5 and PC6.
Quality metal film resistors, film capacitors and ceramic tube sockets are standard with this kit. The PCBs are manufactured to FR4-TG standards with ground planes on both sides to improve screening as well as component screen printing to make assembly easier.
A set of assembly instructions are also included, however tubes are not included. Please also note that the photos are a general indication, and component colors and style can and will vary.
An important note about using the clone kits - if you are going to combine these clone kits containing modern and new components with your older, original PAS2/3 parts, you may experience some unexpected sound issues that were not present with your original PC5 and PC6. Since you are introducing brand new, high-tolerance components with parts that are 50+ years old that may have shifted from their original value/s - this is especially true with capacitors - this mismatch could have undesirable consequences.
PC5 Line Preamp Tubes are 12AX7
PC6 Phono Preamp Tubes are 12AX7
Kit & Instructions: $69.50
shipping to the lower 48 only: $12.00
Kit #2: Z-PC5 & Z-PC6 Phono & Line Preamps
This is the next step up from the original Dynaco circuits. Both the Z-PC6 phono and Z-PC5 line preamps offer vastly improved circuits and performances over the original Dynaco designs, with far superior sound reproduction. The phono preamp Z-PC6 uses 2x 12AT7's and the line preamp Z-PC5 uses 2x 12AX7's. Quality metal film resistors, film capacitors and ceramic tube sockets are standard with this kit. The PCB's are manufactured to FR4-TG standards with ground planes on both sides to improve screening as well as component screen printing to make assembly easier.
NOTE: the tubes require a 24VDC supply for the filaments, not 6.3V or 12.6VDC!
A set of assembly instructions is also included. However tubes are not included. Please note that the photos are a general indication, and component colors and style can and will vary.
An important note about using the Z-PC5 & Z-PC6 kits: you will lose the functionality of ALL tone controls, the original selector switch (a new standard single wafer 2 pole 6 position switch needs to be used, click here), blend, filter and loudness functions. The Z-PC5 is a classic line preamp circuit without any of the above functions. Volume control MUST be 100K and balance control MUST be 250K!
The Z-series will also work with most solid state amps, but, there will always be exceptions and we cannot advise which soild state amps may require an impedance matching circuit, as there are just too many variables.
The output impedance of our Z-PC5 line preamp is around 70K and operates best into a high input impedance load.
If you want to retain tone controls using a modern tube circuit, you will need to consider our TCLA tone control kit, Kit#4 below.
Z-PC5 Line Preamp, Tubes are 12AX7
Gain 12dB
Output Impedance 1.8K
Freq response +/- 0.05dB between 20Hz & 20KHz
Z-PC6 Phono Preamp, Tubes are 12AT7
Gain is 40dB, MM cartridge only
Input Impedance 47K
Freq response +/- 0.15dB of the RIAA curve between 20Hz & 20KHz
Kit & Instructions: $79.50
shipping to the lower 48 only: $12.00
Kit #3: Z-PH20 Premium MM Phono Preamp
This is our ultimate phono preamp for your PAS upgrade. Sonically superior to all other phono preamps we offer, this kit will frankly shame a lot of so-called high end phono preamps currently on the market. It is a hybrid design using a JFET at the critical input stage to ensure super low noise operation and a MOSFET as an output buffer. It also has its very own onboard B+ regulator to ensure optimal performace. This phono preamp uses two 12AY7 triodes. The PCB is manufactured to FR4-TG standards with ground planes on both sides to improve screening as well as component screen printing to make assembly easier.
IMPORTANT NOTE: We DO NOT RECOMMEND that the original PA211 power transformer be used for the Z-PH10 due to the higher current demand of the Z-PH20 circuit. Instead, we recommend that you use one of our regulated power supply upgrades, click here.
NOTE: the tubes require a 24VDC supply for the filaments, not 6.3V or 12.6VDC!
A set of assembly instructions are also included, however, tubes are not included. Please note, that the photos are a general indication, and component colors and style can and will vary.
Kit & Instructions: $71.50
shipping to the lower 48 only: $12.00
Gain 40dB, MM, tubes are 12AY7
Input impedance 47K
Freq response +/-0.1dB of the RIAA curve from 20Hz and 20KHz
Kit #4: TCLA Tone Control Preamp
This tone control preamp uses the excellent and proven Baxandall tone control circuit still widely in use today with tube and solid state tone control preamps. The tone control circuit is designed in such a way that with the controls centered, there is zero influence on the signal. This tone control preamp uses four 12AX7 triodes. The PCB is manufactured to FR4-TG standards with ground planes on both sides to improve screening as well as component screen printing to make assembly easier.
The TCLA will also work with most solid state amps, but, there will always be exceptions and we cannot advise which soild state amps may require an impedance matching circuit, as there are just too many variables.
Volume control MUST be 100K and balance control MUST be 250K!
NOTE: the tubes require a 24VDC supply for the filaments, not 6.3V or 12.6VDC!
A set of assembly instructions is also included. However, tubes are not included. Please note that the photos are a general indication, and component colors and style can and will vary.
The potentiometers used in this kit are only suitable for 'set screw' style knobs, the old push on knobs will not work!
An important note regarding the TCLA: since this preamp uses four tubes, the original Dynaco PA211 power transformer will not be able to handle the additional filament current demanded by the two additional tubes. You will need to use one of our regulated power supply kits, details of which can be found on our power supply kits page.
Gain 12dB, Tubes are 12AX7
Output impdance 800OHMS
Freq response +/-0.15dB between 20Hz and 20KHz
Cathode Folower Circuit
Kit & Instructions: $88.50
shipping to the lower 48 only: $12.00
Kit #5: AIKIDO Classic Line Preamp
This is our classic line preamp (with no tone controls) based on the Aikido topology and recently revised. It is a very sweet sounding preamp with a perfect balance of treble and bass, neither one overpowering the other. This is the preamp you want to use if you do not wish to have tone controls.
The Aikido uses four 12AX7 triodes. The pcb is manufactured to FR4-TG standards with ground planes on both sides to improve screening as well as component screen printing to make assembly easier. A set of assembly instructions is also included. However, tubes are not included.
The Aikido will also work with most solid state amps, but, there will always be exceptions and we cannot advise which soild state amps may require an impedance matching circuit, as there are just too many variables.
Effective output impedance for our Aikido with is 180 OHMS. Volume control MUST be 100K and balance control MUST be 250K!
NOTE: the tubes require a 24VDC supply for the filaments, not 6.3V or 12.6VDC!
Please note that the photos are a general indication, and component colors and style can and will vary.
An important note regarding the AIKIDO: since this preamp uses four tubes, the original Dynaco PA211 power transformer will not be able to handle the additional filament current demanded by the two additional tubes. You will need to use one of our regulated power supply kits, details of which can be found on our power supply kits page.
Gain 12dB, Tubes are 12AX7
Output impdance 200OHMS
Freq response 0.2dB between 20Hz and 20KHz
Aikido circuit
Kit & Instructions: $72.50
shipping to the lower 48 only: $12.00
Kit #35: Center Channel/MONO Preamp
This kit was designed as part of our new PAS-NGTC/NGC preamp kits which have the blend and mono controls.
It can however be used as a 'stand alone' center/mono channel preamp, for those who wish to add this mod to their PAS preamp.
It uses a single 12DW7 tube, which is a unique tube in that one section/triode is of 12AX7 specs and the other is of a 12AU7 spec, and this is a perfect fit for this circuit! Note, the 12DW7 tube is NOT included with this kit!
This mono preamp has been designed to be used with our regulated power supply kits. A standard Dynaco power supply using the PA211 power transformer will not work to power this additional tube.
The pcb has been designed to fit in existing holes around where the old can style multi capacitor was installed. The holes will match the holes around that area.
This mono preamp gets it inputs from the line preamp outputs, usually our TCLA tone control preamp or our Aikido classic line preamp and should be installed with its own 100K single gang volume control at the input, so that the center channel speaker can be independently controlled as well as being controlled by the main PAS volume control.
See our kit#36, Blend Function and Center Volume Controls for the colme control for this center channel preamp.
This is a preamp, not a power amp, so the center speaker must either be powered by its own built in amp or the power amp must have a center speaker ouput!
Kit & Instructions: $40.00
shipping to the lower 48 only: $12.00
Tube 12DW7
