ГУ-17gu-17

Is there a simple way to replace an ELL80 with a Russian ГУ-17 tube?

There are situations where two EL95 tubes (used together) can not be used because of space constraints

Hello,

you should make socket adapter for ELL80 to QQE03/12 or rewire all the connections of the socket...

If you make socket adapter, should put 100-150 ohm more to the cathode resistor and 1-3k resistors to the first grids of the tube to avoid oscillations - this should work. Also you should connect the heaters in parallel for 6,3V of the QQE tube. 

Regards,

Milen

Hello,

there is already an article (in German) about substituting the ELL80 by a QQE03/12 (same as 6360), which appears to be similar to the ГУ-17.

Best Regards,
Jacob

Yes, I came across that article too

It is an excellent write up !

The only concern that I have is, the adapter socket illustrated appears specific to the equipment it will be used for, and is not a "universal" adapter 

I do like the use of varistors and a zener diode, but the use of resisotors seems clearer at first look.   After taking another look at the thread that you refered me to, I will now look in to building an adapater with varistors and and a zener diode 

I understand that you have to change the pin layout and add cathode resistance to pin 7 out of ELL80 socket (150 ohms?) What pins would you add the ressitors to, relative to the ELL80 socket, if one were to use resistors?
 

Is this the right idea?

the corresponding pins:
ELL80 ........ГУ-17 
9 ---------------- 7
1 --------- ------- 7
2 ---------------- 1
3 ---------------- 6
4 ----- ----------- 4
4 ---------------- 5
5 ---------------- 9
6- --------------- 3
7 ---------------- 2
8 --------------- -8

Hello,

the pinmap is OK, 

7----->2 put 150 ohm resistor

2----->1 put 3,3k resistor

6----->3 put 3,3k resistor

The QQE tube is high frequency tube and surely will have oscillations without that 3,3k resistors... If still have, should change them with bigger values.

On a thread that was mentioned earlier here for adapting use of this tube, it was suggested to use two varistors and  one zener diode

ELL80                       ГУ-17

1 -----MOV-14D101K---7

2 --------------------------- 1

3 ---------------------------- 6

4 ---------------------------- 4 & 5

5 ---------------------------- 9

6 ---------------------------- 3

7 -----BZX85C5V6-------2

8 ----------------------------- 8

9 -----MOV-14D101K---7

I am wondering if this adapter is as "universal" as an adapter that would use resistors  The 150 ohm resistor  would possibly cause a lot of heat, where as a zener diode and varistors would not

What are your thoughts?