Need input on Buffer stage to use in Preamp..

[Adrculda]

Hey guys...
I'm well under way on a amp build im working on currently and would like to slowly start gathering parts for the matching preamp.
starting with the output, i would like to have a selectable output configuration and want to incorporate a tube buffer or preamp stage on one output and a HDAM preamp on the other.

Theres a lot of EBAY kits and im not to tube "savy" so i figgure before i start burning money is always worth asking which one is worth it and what to look for


The reason why i want to incorporate a tube section is because i had to replace a board and a few items on a friends Dynaco PAS2 and after had it for a "burn in" for 2 weeks it sounded amazing to me, hence why i want to add one to my build

ALSO, balanced signal handling would be a BONUS !!!

Input needed on this kit to start off with...

[Zen Mod]

drek - short and simple

if you need tube buffer - SLCF , Allen Wright , google

edit : for 143$ ........ better use much smaller money , and buy tube preamp cookbook and supercable cookbook from mentioned tube wakoo ...... that way you'll learn something ..... and never ever think again about buying audiophool fog on ebay

[mashaffer]

I must expose my ignorance. What is an HDAM? A full fledged tube line amp is so simple I often wonder why a buffer on something else has so much appeal.

[Adrculda]

HDAM Module is basicly a high end audio opamp built from scratch with audiophile components.

HDAM Module Review by HeadFi.org

URL at the end of the Review was supposed to Point HERE

[Wavebourn]

Originally Posted by mashaffer

I must expose my ignorance. What is an HDAM? A full fledged tube line amp is so simple I often wonder why a buffer on something else has so much appeal.

It is from another reality, where conductivity is measured in RaMaOhms between Chakras.

[mashaffer]

Originally Posted by Wavebourn

It is from another reality, where conductivity is measured in RaMaOhms between Chakras.

Oddly I had to look up Chakra too.

[Adrculda]

hmmm...

i know its ebay again...
Jadis JP-200 JP200 Tube Pre Amplifier
but like i said earlier, i just want a PCB to make my life easy !!!

Given if i buy 2 boards can i use them to "buffer" balanced signals ??

And what benefits would a tube regulated supply give ???

[Arnulf]

Well, you could ... I just wonder why you'd need this horribly inefficient use of ECC83s doing double duty WITH 2000+x GAIN functioning as a buffer. Do you plan to put an attenuator somewhere that will quiet this thing down two thousand plus times ?

Oh and ECC83 doesn't make the best cathode follower out there, no matter what the schematic in your link says.

[Adrculda]

Basicly what I'm doing is building a Pre-amp to my own needs and wants....

Will include basic functions as Volume and Source Select - 4 XLR pairs, 2 TRS Pairs and 5 RCA Pairs with a "Monitor" Function. This will allow the use of a external processor or DSP and will have 1 pair of XLR's and TRS's . All unbalanced signals will be up-converted to Balanced Signal and handled internally in the balanced form. Output will be Balanced ( XLR and TRS ) and will also include a summing amp to have a pair of RCA's.

The Output Section will be selectable as either tube to HDAM modules with JFET's
Still debating if i want to incorporate a DSP board for time correction with a Graphic or Parametric EQ, but will have a Bypass for "source direct" mode.

For the Tube Section I'm looking to find a PCB that i can populate on my own and dont have to go through the trouble of trying to do a complete layout.


The whole idea of this preamp is to have a clean, accurate and detailed sound with best of both "worlds" tube and analog.
Maybe eventually will add a digital output section as well... maybe...

[Adrculda]

Here's a small list of all the tube boards DIY Audio Kit offers...

Marantz 7C 7-C Tube Pre Amp

Tube Pre amplifer PCB, Based on McIntosh C-22

Matisse Fantasy Pre-Amp

6SN7 SRPP Tube Pre Amplifier PCB


6N3 (5670) Tube Buffer

Another vendor - 8 Audio has a few too...

Upgraded design for Mcintosh C22

Upgraded Design from Marantz 7

Upgraded design for ARC SP10

Upgrade design for C.J. PV-12

Upgraded design for Cary SLP90


Upgraded design for Jadis JP200


Input please !!