Oh..yes, you're right. Since there is 13mA channel and 150v/0.013= 11.5k. 11.5k of 0.013 = 1.94w. What if I could get some 200v zener, could it be better ?? But still I'm going to source and or design a simple regulator amount those 3 legs that I have and they're TIP50, MJE350 & IRF840. I'm aiming at something 30-40mA channel.
It's almost time to put everything together. Please comment if I could do better on lay-out and wiring.
I still have one question since the choke is only good for 230mA, but the tranny is good for 500mA. I'm thinking if I could re-route - RC after the rectifier - to make another supply for the 200v/& 250v supply ??
I still have one question since the choke is only good for 230mA, but the tranny is good for 500mA. I'm thinking if I could re-route - RC after the rectifier - to make another supply for the 200v/& 250v supply ??
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Hi there!
It has been a while since i last visited this thread, and it is very much related to my current project. Lots of great ideas! (ΓΥ-50 SE for guitar). So, I have around 480V HV, and a 3.5 KΩ transformer. So far, I have pushed the G2 up to 240Volts without issue. As Wavebourn says, I can almost go all the way up to HV+. (It is through sweries dropping resistor from HV+capacitor to ground) Could you please confirm?
And another thing that seems odd to me at least. Not one schematic here, from what i saw, includes grid stoppers. I thought it was standard practice?
Regards
It has been a while since i last visited this thread, and it is very much related to my current project. Lots of great ideas! (ΓΥ-50 SE for guitar). So, I have around 480V HV, and a 3.5 KΩ transformer. So far, I have pushed the G2 up to 240Volts without issue. As Wavebourn says, I can almost go all the way up to HV+. (It is through sweries dropping resistor from HV+capacitor to ground) Could you please confirm?
And another thing that seems odd to me at least. Not one schematic here, from what i saw, includes grid stoppers. I thought it was standard practice?
Regards
Hi Costis,
well, compared to the most commom and usual AF power tubes, the GU50 features much lower gm, and thus perhaps isn't prone to oscillate?
Best regards!
Well, due to the fact that this tube was produced in the formerly GDR as P-50, this leads me to the assumption that it had found it's way to Russia via Eastern Germany. Am I right?
Best regards!
Yes, and they had to pay a lot of License fees for the right to "copy the russian transmitting tube"...
at the former Telefunken Tube Factory in East Berlin where the LS50 was made - also known as "WF".
regards
Edit: this tube ist the SRS552M and SRS552N
I was referring not only to the power stag, but also in the pre/driver stages. No grid stoppers!
No, don't worry. Just tie G2 and G3 to anode, that's it.
I did not try without them, use routinely.
I heard that they were redesigned by Germans, frm LS-50 to Gu-50. But I am not sure they did that in Germany, may be in Sibera...
Sorry if I was not clear, I am referring to pentode operation. But I guess it's the same ratings.
I also use grid stoppers routinely. Thanks!
Ah no, for pentode operatin I would not recommend more than 300V on screen grids!
I personally use currents of screen grids as an idicator of clipping approaching, to control opto attenuator of input signal (second LED in series drives overload indicator).
Hi Wavebourn
Nice to see you around here.
Once I asked for the schematics of your Pyramid and you never answered.
Sure, for your buddies are available.
No matter, no longer need it.
Oops... Sorry, I never read all forum.
Hi Wavebourn
Thanks for sharing.
When you come to Argentina we eat an "asado"
It's like a barbecue but much more delicious.
Best regards
Popilin
You said that!
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