Universal tube preamp PCB, ECC99/6N6P/ECC88/ECC85/6922/6DJ8 etc. MU follower or SRPP

[vlad1980]

(Partially genuine Googgle translate, from France 🙂 )
Hello everyone, hello Koifarm (fantastic project). I land late on this thread, and I'm a bit of a noob. I'm thinking of assembling this preamp in not too long - I'm currently on the NuTube B1 from Nelson Pass. ... And since I have Russian tubes to use (6N6P or 6H6P ? memory)... Some newbie's questions 🙂:

• The PCB with the 2 tubes is stereo, and not mono? It does not take 2 pcb and 4 tubes for stereo ?
• Does anyone have a PCB to dispatch? I am very interested! (otherwise I order, JLPCB I think, maybe in one month)

... and probably a few more questions afterwards 😀

Friendly,

Geofdk

Hi

I can help you with one PCB.
Send me PM with shipping details.

Regrads,
Vlad

 

[geofdk]

Hi Jean-Paul & vlad1980, could you send me MPs for the PCB ? I'm new on the forum, and can't init/start a conversation ...
Thanks ! 🙂

 

[geofdk]

Hello Jean-Paul, could you send me a message for the PCB ? As i said, can't contact you because i'm new on the forum, and can't send private message (After, i will maybe ask Vlad1980 too) . "Merci d'avance" / Thanks (!), for you (and Vlad). Geofdk

 

[bjohng]

Anyone with a spare board (here in US) interested in swapping for an "Ultimate Tube Preamp Power Supply" board see https://www.diyaudio.com/community/threads/the-ultimate-tube-preamp-power-supply.389308/

PM me if interested

 

[geofdk]

PCB received from Jean-Paul (thanks !). A question: the PCB* is for the SRPP or the mu follower (or the both) ?
*(& the Gerber file from Koifarm, thanks again 🙂 )

 

[Koifarm]

It is for both. See the schematics in post 1. For SRPP just leave a view parts and place some shorts. Mu follower is better in psrr .

 

[geofdk]

Thank you, Koifarm ! (& what mean psrr ? 🙂 )

 

[Barry NJ]

PSRR = Power Supply Rejection Ratio

 

[docentore]

Looking for 2 bare PCBs in EU. Thanks.

 

[jean-paul]

Hi I have at least 1 left and maybe 2. Send me a PM please.

Mine are red.

 

[_henry_]

@Koifarm @Vunce
any recommended linear psu pcb that i can purchase of ebay to run some tests? as i tested my initial simple unregulated linear psu, it has loud hum and buzz...

 

[Koifarm]

Or first couple ground heatersupply to ground anode supply. you can do that with a wire or a 1uf capacitor.

 

[_henry_]

Im not quite sure what you mean, was your response accidentally edited?

 

[Vunce]

Henry,
This is a link to the psu board I use with koifarm’s preamp board. Its a bare board with the option the add the important Micrel regulator chip.
https://www.ebay.com/itm/1448178644...ar=444066039022&widget_ver=artemis&media=COPY

 

[_henry_]

sorry i just re read it @Koifarm , yes i did connect the gnd heaterupply and anodesupply.

thanks @Vunce

 

[Koifarm]

Henry what is your setup?

 

[jean-paul]

One red PCB left for the enthousiast.

So it is not black or green but red. Just the PCB. Europe only as shipping to elsewhere is not worthwhile.

 

[_henry_]

Henry what is your setup?

Hi @Koifarm This is the linear psu that i tried

 

[Koifarm]

And on the pcb mu follower or srpp topology? And what tube do you use? If you shorten the input to ground you have still humm?

 

[_henry_]

Its the mu follower, using 5687 tubes (values per your schematic) if the input shortened to gnd, NO hum.