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

[Carl_Huff]

Enough time has lapsed where at least a few of us will have built this 'universal tube preamp'. If you have, please share your impressions and experience with the rest of us.

 

[platon.rado]

Yours plays better than this.

https://www.musicdirect.com/equipment/amplification/preamp/icon-audio-la5-tx-tube-preamp/

I used this source https://www.aliexpress.com/item/100...order_list.order_list_main.179.1e4d18028KRdjf

 

[Vunce]

I first used this recommended SMPS, it was very noisy and a piece of junk, don’t bother.
https://www.aliexpress.com/item/1005001407107303.html

Then I used a conventional linear psu and this preamp board sings beautifully.

 

[platon.rado]

Yes linear is better.
I have no noise with this
https://www.aliexpress.com/item/100...order_list.order_list_main.179.1e4d18028KRdjf

 

[Bas Horneman]

I should know in the next couple of weeks.

Some resistors I put on the other side. I like the idea of the warmer resistors to be on the top of the pcb instead of under.
Some cotton I have to remove I see from the pics.

 

[Carl_Huff]

"I first used this recommended SMPS, it was very noisy and a piece of junk, don’t bother ...."

"Then I used a conventional linear psu and this preamp board sings beautifully."

Vunce, are you able to share the details of the linear power supply that you are using?

 

[Vunce]

I posted my setup back in 8/22, there are several posts and then a spin-off power supply was created/revised. Not sure if that one got built and verified to work correctly.
I believe the eBay member is HVForless that the psu board I used was originally created by.
https://www.ebay.com/itm/1448178644...ar=444066039022&widget_ver=artemis&media=COPY

 

[Carl_Huff]

Vunce said' "I posted my setup back in 8/22 ..."

Could you please point me at your 8/22 reference. Sorry but I cannot seem to find it on my own.

 

[Ripster]

probably page 4 post 65 from August 2022

 

[Bas Horneman]

Could you please point me at your 8/22 reference. Sorry but I cannot seem to find it on my own.

https://www.diyaudio.com/community/...8-etc-mu-follower-or-srpp.388295/post-7096123