• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Homemade tube socket adaptor

Koonw

Member
2013-04-09 9:37 pm
Have you ever make tube socket adapter? If you have please share your ideas. Here I want to share the way I made it. The pins are pulled from wafer connector and square pin, one side is grounded round to ~1mm diameter (on press drill or hand drill). The ceramic tube socket has a small recess on top so a M3 nut can be fitted level to the socket. M3 screw hold the 2 sockets together tight spaced so the pins are 2mm apart. The square end of the pin tinned and then push into one of the socket receptor, and soldered. I wired it up for pentode strapped triode of a pentode triode tube, such as 6f12p so the tube pins are compatible with 12ax7, but G2 is wire directly to plate in adaptor so that pin 9 will be freed. It's a great way for comparing tube sonic without rebuilt another circuit.

12ax7 6f12p
1 3, 8
2 6
3 7
4 4
5 5
6 9
7 1
8 2
9 -
 

Attachments

  • diy tube socket adaptor-1.JPG
    diy tube socket adaptor-1.JPG
    23.7 KB · Views: 763
  • diy tube socket adaptor-2.JPG
    diy tube socket adaptor-2.JPG
    27.7 KB · Views: 744
  • wafer conn.JPG
    wafer conn.JPG
    19.7 KB · Views: 745

Francois G

Member
Paid Member
2004-06-16 8:36 pm
Illinois
Here I want to share the way I made it. The pins are pulled from wafer connector and square pin, one side is grounded round to ~1mm diameter (on press drill or hand drill).

@Koonw is the only one on this thread (post #1) that showed a noval adaptor, and grinding square pins to fit a noval socket seems tricky (and a lot of work). He did not explain what exactly he does with the pins, but I assume the square side of the pin is soldered onto the bottom socket, with the rounded pins sticking out to form the plug-side of the adaptor Couldn’t one buy round pins of the correct diameter and solder them into the bottom socket to create that plug?

Does anyone else have easier noval adaptor building techniques to show, and where you sourced parts for the adaptor.

My interest is to build an adaptor for sub-mini tubes on top to a noval plug at the bottom. That noval plug has been a problem to do.
 

kodabmx

Member
Paid Member
2011-10-31 1:00 am
Toronto
Subminiature like 6N16B? Use a DIP 8 socket, make a small round board for it, and modify these to fit the 8pin board where the top socket is?

NEW 9 PIN TUBE SOCKET SAVER for 12AX7 EL84 12AU7 5751 12AT7 etc- FAST USA SELLER | eBay

Someone already makes a PCB for it. 10pc Subminiature8 B8D tube adapter bare PCB For GE6021 6N16B 6N21b 2.0Round ver | eBay

You could also just plug the submini tube into the socket saver like this guy: Subminiature Tubes (6111, 6021) on 9-Pin socket (6DJ8, ECC88, 6922 etc) << FET Audio | Hi-End Audio & Electronics
 
Last edited:
DIY tube adapters
 

Attachments

  • Tube_adapter_pins.jpg
    Tube_adapter_pins.jpg
    123.8 KB · Views: 63
  • Tube_adapter_PCB.jpg
    Tube_adapter_PCB.jpg
    75.7 KB · Views: 140
  • rsz_spud_tube.jpg
    rsz_spud_tube.jpg
    237 KB · Views: 137
  • Pin_straightener.jpg
    Pin_straightener.jpg
    359.3 KB · Views: 127
  • Octal_look.jpg
    Octal_look.jpg
    626.1 KB · Views: 126
  • DIY_Octal_Fakes.jpg
    DIY_Octal_Fakes.jpg
    615.9 KB · Views: 135
  • Gold_Novar_socket_saver.jpg
    Gold_Novar_socket_saver.jpg
    77.9 KB · Views: 54
  • Adapter.jpg
    Adapter.jpg
    809.3 KB · Views: 59
Last edited:

Francois G

Member
Paid Member
2004-06-16 8:36 pm
Illinois
Thanks for your suggestions, gentlemen.

Hehe, @smoking-amp, I like your spud adaptor! Does it work? What are the Ua, S, mu and current of this “device”?

Subminiature like 6N16B? Use a DIP 8 socket, make a small round board for it, and modify these to fit the 8pin board where the top socket is?

Koda, what I would like to do is to have an adaptor/base-plug that I could solder the sub-mini leads to and have noval pins, so that I could tube-role say a 6N16B instead of a 6CG7 that have similar mu and S (of course be cognizant of the plate voltage and dissipation which are different).

I already soldered subminis to an octal plug and that works fine in an amp with octal sockets. Like these:
Plug - 8-Pin octal tube base, Black Plastic | Antique Electronic Supply

However, I can’t find similar noval plugs. Does anyone know of any? Hence my quest to make such an adaptor. Koda’s suggestion to solder the leads to a noval socket saver will probably work OK. The noval socket savers I have have “terminals” that go straight through from socket to pins out the other side.

Ideally, if I have a PCB that the submini leads could be soldered to AND have holes to solder the pins for insertion into a noval socket, I’ll be in business. This PCB should be at least 2mm thick (to support the pins) and preferably 3mm. Then I just have to find the correct pins.
 
What would I need to make an adapter from 12AU7 to 6SN7, parts wise?


The 9-pin to Octal adapters allow 6BQ7/6BK7 to be inserted where 6SN7 or 6SL7 would normally go. The adapter to 6SN7 has one K resistors in the cathode leads to reduce the gain a bit, more like 6SN7. All the grid leads have One K CC resisters to dampen any RF. And the label is incorrect!!:rolleyes:

The other adapter is a pick off that allows cathode current to be monitored in a Peavey 120W guitar amp. One of my Grandsons is a sometime Rock Guitarist.:)
 

Attachments

  • Bias Probe Finished.jpg
    Bias Probe Finished.jpg
    684.6 KB · Views: 73
  • 6BQ7 Adapters E.jpg
    6BQ7 Adapters E.jpg
    66.7 KB · Views: 58
I see those unsupported house of cards so called "adaptors" and cringe.

Personally I would decide once and for good WHICH type of tube I will use, remove the offending socket and install the proper one, enlarging hole if necessary or adding a small piece of sheet metal to partly close it, which does not add height, beyond its own thickness.

I mean, I can see its usefulness for testing, but using them in any permanent build is ludicrous.