@@janno288 i think i never draw it... nothing more than the basic Hartley oscillator diagram and a level shifter power supply for plate and screen grid.

@MrCoccante I am trying to make my own hartley gu-81m vttc which is on my channel, you seem to have success with pentode mode. I mostly want to know what hartley oscillator type you use

@@janno288 hull hartley oscillator. Primary coil between plate (via DC blocking capacitor) and grid (via grid leak RC network), coil tap to ground. Shunt feed plate with a rather big RF choke.

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No. It's a mercury vapour rectifier runnig at 2kv. No X rays, only some UV. For X you need much more than 2kv...

Yes. Haven't got enought hv caps at the moment.

In teoria trizio, ma non sono sicuro. Non ho trovato datasheet specifici di quel tubo. L'interruzione è il numero uno! 😂

@@MrCoccante hahahahaha grande! Se vuoi un giorno passo col mio contatore così lo testo e ci divertiamo un pò 😂Diciamo che il trizio emettendo beta a 13keV non son sicuro riesca ad essere rilevato dal geiger, se sulla sonda non hai una finestra di mica molto fina. Ho un tubetto di trizio a casa, ma con una pancake Ludlum 44-9 lo si rileva difficilmente e quasi a contatto. Secondo certi esperti potrebbe essere rilevato soprattutto grazie alla bremsstrahlung, ovvero il tubo geiger rileva raggi X prodotti indirettamente dalle beta, ma è molto difficile lo stesso. Inoltre ha un'emivita di circa 12/13 anni. Mi sanno di Cs-137 , magari per più della metà decaduto, ma potrei sbagliarmi

I used it as output transformer for a GU81M class A audio amplifier 😀.

@@gordonwelcher9598 813 tube, around 80 - 100W on CW.

Sligtly less inverse voltage compared to an 866. Is not working hard here.

Thanks! The cabinet is much bigger than needed. But is almost made with parts i had, cabinet included. I may put a mercury vapor thyratron for the staccato controller... only to see the blue glow 😊

@@MrCoccante 😍😎👍

Thanks! It was the base for the late vttc with the gu81m in Hartley circuit.

@@MrCoccante its really nice, good work my friend 😎😎 Steve

Me too! That's why I got a Cetron 8008. I am hoping to fit it into the GU81 build somewhere.

@@jameshicks7125 yeah they are really cool, if I ever build a finished coil I would look towards some form of Vacuum tube rectifier too, I've tried thyratron, and kenatron etc in the past .. this coil is really cool, really nice build .

No, it's all original. Fono input signal is connected to the second ECC83. First one is only for microphone, each section for one mic input.

Thanks for the reply, I got me a G3272 model i picked up last sunday, so i can just connect my phone to one of the fono input without any problem?

@@pepsodenttube i think yes.

Don't know... with no load you get something near the real output of the transformer. With load (arc) output voltage drops a lot because of the voltage drop in the ballast.

@@MrCoccante hmmm.. would it help to connect 2 of these ballasts in paralel in series with the phase? I think it would lower the voltage drop then?

@@mcsaatana1614 yes. In this way you increase the power that can be used, voltage drop is lower but always present. Any type of ballast introduces a voltage drop.

@@MrCoccante i would need a ballast which gives maximum power but wouldnt pop 25A fuse. Any ideas?

@@mcsaatana1614 an arc welder is a good choice, you can adjust the power. Or a ground of reactors for mercury or similar lamps whit a total power lower than the max you can drain from the mains.

Used as a ballast for a hv transformer? Yes. Never used but yes.

@@MrCoccante thanks for the answer! I was just thinking that that setup is single phase, so have to ask have you linked the one phase to all 3 L connectors?

@@mcsaatana1614 no. I use only one phase. Input between one LV phase and neutral (LV winding star connected). Output between two hv terminals (hv winding delta connected).

@@MrCoccante Thanks, that cleared a bit. Does the offload tap changer change primary [and/or] secondary connections like Star, Delta etc or does it just adjust the HV side voltage?

@@mcsaatana1614 adjust the hv side only. Three taps -10% 0 +10% if i remember correct.

4 yellow caps 0.15uf each and a 0.047uf, all in parallel. Fast diodes are byw29.

@@MrCoccante tanks my friend

Scrivi pure quì...

@@MrCoccante alla fine me lo sono procurato il trasformatore. Posso sapere come lo alimenti? Che apparecchi usi tra la rete enel e il trasformatore per alimentarlo?

@@jorgebeniti6898 lo alimento tra una fase e il centro stella. Alimentato tramite variac e limitatore di corrente del tipo reattore saturabile.

@@MrCoccante vuoi dire con tre fasi e il neutro al centro stella

@@jorgebeniti6898 No. Monofase tra una fase e il centro stella dell'avvolgimento BT (stella) e uscita tra due terminali dell'avvolgimento MT (triangolo).

Non lo ho mai disegnato. È sempre stato un prototipo. Di base ricalca esattamente lo schema di principio di un oscillatore Hartley a triodo. Bobina con gli estremi alla griglia e, tramite condensatore di accoppiamento, alla placca. Presa intermedia a massa. Alimentazione anodica tramite induttanza di blocco rf. Il vttc del video poi è stato smontato.

We have 10, 15 and 20kv. Both overhead or underground.

@@MrCoccante Was 5 or 6kV also used 40 or more years ago?

@@mernokimuvek may be. I don't know.

Yes, made in Italy in the '70s.

Yes. Whithout limiting current reach extremely high values. In this case hundreds amps....

@@MrCoccante what is the easyest way to do this ?

@@tristanreinhard4732 arc welder transformer used as a series reactor. Or simply a reactor for mercury lamps.