Salas handing the Itch I broked the glass of one 6N2P-EV and when powered "on" lits blue so I have to change, because 6N2P-EV Voskhod & Sovtek 12AX7LPS have more or less the same price on ebay the question is can I use the Sovtek? is better the Sovtek?
TIA
Felipe
TIA
Felipe
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thks, BTW your Jensen is 1:10? meanwhile Voskhod arrives could I use standard ECC83/12AXT?
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Too complicated I will wait to arrive the Voskhod. What's the MM voltage input 3mV? Can increase 5dBs of gain, so I will use Partridge 977 x6?
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One is a 6.3V valve the other one is a 12.6V valve as you see.
So to heat the 6N2PEV you give 6.3V to pins 4,5 and pin 9 is a shield that goes to ground.
When to heat the 12AX7 with 6.3V you short 4,5 and you put that voltage between them and pin 9.
There is no shield and no low grid leakage spec provision. So you could possibly need the diode trick if you will try with 12AX7/ECC83.
So to heat the 6N2PEV you give 6.3V to pins 4,5 and pin 9 is a shield that goes to ground.
When to heat the 12AX7 with 6.3V you short 4,5 and you put that voltage between them and pin 9.
There is no shield and no low grid leakage spec provision. So you could possibly need the diode trick if you will try with 12AX7/ECC83.
Definitely I will wait for a new couple of Voskhod.
What's the MM voltage input 3mV?
Can increase 5dBs of gain, so I will use Partridge 977 x6?
What's the MM voltage input 3mV?
Can increase 5dBs of gain, so I will use Partridge 977 x6?
There is 43dB of gain in the main circuit that can be used with HMC even. As it had been done at least by one user with success.
Combining the 977 it will go near 59dB. Are you sure its not enough for the cart you got in mind? Because to get more gain means different second stage tube modification.
So can be the reason why I asking more gain....What ratio step-up did you used before the Jensen?
I used pin yellow as input & pin red as output????
I used pin yellow as input & pin red as output????
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x10 again, it was a Dynavector DV/6Z step-up. That makes 63dB in combination with the Itch.
I don't remember the 977 pins. But you can use your generator at 10mV/1kHZ and see on your scope which way it goes X6.
Should give about 170mV pk-pk on screen when used the right way.
(In which way it steps up in general is enough to find. Because if your generator impedance is high it may alter the multiplication figure).
I don't remember the 977 pins. But you can use your generator at 10mV/1kHZ and see on your scope which way it goes X6.
Should give about 170mV pk-pk on screen when used the right way.
(In which way it steps up in general is enough to find. Because if your generator impedance is high it may alter the multiplication figure).
Obviously, but some say do not use DMM that puts DC to measure Ohm on delicate core transformers or cartridges, it supposedly can magnetize them. I am doubtful, but I let you know.
I have to get away now, I will come back this afternoon. I changed the broken glass tube for a new one not Voskhod that I have in my parts bin, more problems Left channel don't sound...
The pickup cartridge spec I ask. Maybe its too low Ohm and the matching is not good for the primary losing gain.