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Hi guys, i am learning how to use tubes, i got 6p14p-k, which is amplification output pentode (made by guys in russia '76)
it was used in gramophone or something like that, so i got idea to learn what it was used to.
I calculated basic schematics liike this:
250V o-------------------------------------------------
I I
I 3 output transformer
I I
R 50k R 5,5k/12W
I I
I / A /
I / /
I / --- / -------I G3 (internal connected with cathode)
->G2 / --- / I
/ --- / I G1 <-- input 3,4V
/ / I
I--------------- / ^ / -------I
I
R 120R filament 6,3V
I
ground o-------------------------------------------------
but i have no idea if i should use capacitors in (cathode - ground / self biased) and (g1 - ground) and resistors in g1 and if output transformer is between good points (i also seen serial trafo and capacitor between anode and ground as output)
I am aware of high voltages - not new in electronics, but i know little about how vaccum tubes works (and reading is not enough, i want to try ).
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Suggest you connect 10ufd/25volt K- Gnd and 10 ufd-300 volt G2-Gnd Connect 470k G1-Gnd and Connect .025ufd/250 V from G1 to drive signal source. Signal drive needed about 3 volts.
Do not operate amplifier without some load resistor across the secondary of the ouput transformer when the loudspeaker is disconnected.
Yes, i am still alive (if somebody cares ), i did what you reccomended to me, and it works, BUT it is too silent.
I used dc to dc converter (i will not use 230 mains yet, i dont like working with that) with doubler, worked fine i had nice 250V (and able to adjust voltage precisely - wonder of dc converters :) ) I used output from cd player, i dont know if it has 0,7 or 1,7V , cant measure it, so this was first error - low drive voltage. I tried to make some input transformer (1:2) but it didnt work
But the second and main problem - as output transformer i used core from PC power supply (toroid), i just unwind few not-necessary windings, so i got only 1:1 basic trafo, but it seems it takes away about half power - i unplugged trafo out and plugged speaker, it was louder (but only as loud as i would get from my audio source, so... ). Speaker was TESLA ARE589 (4ohms, 3W), and quite impressive performance to run directly.
What output trafo should i get or make? I would rather do one than buy one. Use ferrite cores, iron cores, toroids, EI ... and what transformation - 1:1 or other? I am waiting to have some binocular ferrite cores, i will also try it with them
Now i am doing PCB, as there is nothing to improve, it works really well i will also make some transistor pre-amplifier, OR i got another tube (6i1p-k)so maybe i use that. I could also try to run some small teslacoil, with 12W of power it could be better than my other ones.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
You need to use an iron core transformer to match the valve to loudspeaker. the center core leg should be 2 CM x 2CM and the core needs a thin paper gap. The primary impedance is 5500 ohms and secondary to match your speaker (8 ohms? ferrite core wont work well. Zp = Zs*N^2
You can calculate the turns ratio. However to start with, if you can get an old transfomer wall power pack about 240 V to 6 VDC, disconnect the rectifier and just use the transformer. Use the low voltage side to the speaker and the 240 volt side to the anode and b+ voltage (250) this will work as an audio output for now.
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Basic vaccum tube amp
).
), i did what you reccomended to me, and it works, BUT it is too silent.