My new baby 🙂
I used some parts recovered from old radios, but NOS tubes.
The two audio output transformers are from an old Grundig stereo radio (10K single ended for EL95/ELL80), the same for filter choke and the vertical 100+50+50 uF triple electrolitic filter capacitor.
The magic eye is an EM87 and the full wave rectifier is an AZ41 high vacuum tube (schematic not shown).
I used some parts recovered from old radios, but NOS tubes.
The two audio output transformers are from an old Grundig stereo radio (10K single ended for EL95/ELL80), the same for filter choke and the vertical 100+50+50 uF triple electrolitic filter capacitor.
The magic eye is an EM87 and the full wave rectifier is an AZ41 high vacuum tube (schematic not shown).
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Last edited:
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Schematic updated
Pout = 2 x 0.25 W for triode connection - 2 x 1.1 W for pentode connection
Vac = 250 + 250 Vac - 65 mA (for two mono units)
Vf = 6.3 Vac - 2.5 A (two mono units, with full bridge rectifier 6X5GT)
http://www.lovisolo.com/valvole/per-cuffia.jpg
http://www.lovisolo.com/valvole/tone-control.jpg
Tone control:
+B = 30Vcc 10 mA
Pout = 2 x 0.25 W for triode connection - 2 x 1.1 W for pentode connection
Vac = 250 + 250 Vac - 65 mA (for two mono units)
Vf = 6.3 Vac - 2.5 A (two mono units, with full bridge rectifier 6X5GT)
http://www.lovisolo.com/valvole/per-cuffia.jpg
An externally hosted image should be here but it was not working when we last tested it.
http://www.lovisolo.com/valvole/tone-control.jpg
Tone control:
+B = 30Vcc 10 mA
An externally hosted image should be here but it was not working when we last tested it.
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Nice, I like the look of it. How did you re-make the back panel?
Do you have some kind of resistor load switched in by the headphone socket when the phones are out?
100R in the screen for the 6G6 would be a good idea.
Cheers
Matt.
Do you have some kind of resistor load switched in by the headphone socket when the phones are out?
100R in the screen for the 6G6 would be a good idea.
Cheers
Matt.
You're right! I forgot the two load resistors.
Just added 100 ohm resistor in parallel to the output, also added screen resistor for pentode mode.
Thanks! 😛
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Sorry, I must be blind, I didn't see the 100R across the output. Doh.
So how did you get the back panel to come up like that?
Cheers
Matt
So how did you get the back panel to come up like that?
Cheers
Matt
The 100 ohm is in parallel to the output (reload the page).
The back panel has been recovered from an old radio from RCI (Radio Corporation of Italy), the same for the chassis and the main transformer, all the other parts are new or N.O.S.
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6V6 version - very old tubes!
6V6G (Fivre 1942) and 6SN7GT (Fivre & Philips 1950), the full wave rectifier is a 6X5GT (RCA 1950)
The 6V6G is connected in triode mode.
The analog vu-meter is for the output, the magic eye is for the input signal.
The sound is fantastic! 🙂
6V6G (Fivre 1942) and 6SN7GT (Fivre & Philips 1950), the full wave rectifier is a 6X5GT (RCA 1950)
The 6V6G is connected in triode mode.
The analog vu-meter is for the output, the magic eye is for the input signal.
The sound is fantastic! 🙂
An externally hosted image should be here but it was not working when we last tested it.
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