Suggest me a preamp for my F4!

Paypal account made ;

but - Murphy rulez - due to some unfortunate circumstances there is a mixup with plastic - I need Visa ( to be able to lift limits) , and I was given with funny Maestro card :rofl:
I need to change it for Visa in next several days , then thingie will be functional
problem is that Serbia isn't covered with Paypal service , so I'm doing all this with Hungary based bank account ; to solve card issue I need to go to Hungary once more :rofl:
 
RC ........
 

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I've managed to clone the borbely amplifier. It's amazing what you can do with a bit of ingenuity and a computer.

If anyone wants any details, please e-mail me. I can't post details on this site for copyright reasons.

I've also got a Shuntky/Pumpkin pair on the go to compare them.

Many Thanks ZEN-Mod the PCBs and matched semiconductors arrived.

I managed to build the borbely pair for less than £50.00, but beware, the 190VAC mains transformer is not a standard device. Initially I hand built one from a 100VA kit but it was too big to fit in the box and I couldn't get nice end cheeks to compliment it. In the end I spent another £50 and bought 5 x 0-22 + 0-22 1.6VA toroids from RS. Using 9 of the 10 secondaries in series gives me the appropriate HT. The last 22V secondary gives me the -12V aux supply leaving me with yet another 30VA toroid to produce 15V for the 12.6V regulated heater supply. 6 transformers in all but all tiny and fit inside the chassis beautifully.

The ECC81 and ECC83 valves aren't cheap but they are readilly available.
 
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Please resend, I dont find it. Thanks!😀

Russellc

done

I think that tracking expired on my post's tracking site , but you can check at your side

USPS - Track & Confirm - Put our delivery information to work for you

I just did and it sez ( again ) :

" Search Results

Label/Receipt Number: RR14 1439 046R S
Service(s): Registered Mail™
Status: Origin Post is Preparing Shipment

We have received notice that the originating post is preparing to dispatch this mail piece. "