Mullard Valve Tester Card Project - Page 8 - UK Vintage Radio Repair and Restoration Discussion Forum

GMB · 24th Dec 2023, 12:40 pm

I am surprised that you have seen it as not issued as it seems to be quite common.

Ed_Dinning · 24th Dec 2023, 4:45 pm

Hi George,thanks for the info, it must be my listing. It also lists the 680 card as suitable

Cheers, Ed

theredhouseinn · 8th Aug 2024, 2:05 pm

Hi folks.
I am back on the job of making missing cards for my collection.
I have a complete set up to 600 apart from 87 & 374.
In the 600 range I am missing no's - 603,604,605,608,609,610,611,612,613,614,615,617,618,621,622,623,624,625,626,627,628,629,662,667,675, 676,677,678,679,680,681,682,684,685,686,687,688,689,690,692,694,695,696,697,698, & 699.
In the 700 range I am missing no's -
700,701,702,703,704,705C,722,723,724,725,726,727,728,729,730,731,732,733,734,736,738,739,742,743,744 ,745,746,748,749,751,752,763,765,777,779,780,783,785,786,797,798, & 799.
In the 800 range I am missing no's -
802,805,806,807,809,810,811,812,813,814,815,816,819,820,821,822,823,826,827,828,829,831,832,833,834, 835,836,837,838,839,840,841,843,844,845,846,848,849,851,852,853,855,856,858,859,863,864,865,866,867, 868,869,870,871,872,873,874,875,876,877,879,880,882,883,884,889,890,894,895, & 897.
That will do for now. If anyone can help me with pdf templates for these cards it will be very appreciated. I will get on to the rest when I have hopefully made these.
Many thanks
John.

DavidM0ICZ · 29th Sep 2024, 3:22 pm

Here is my card punch, and how it was made and used.

Click image for larger version

Name: punch.jpg
Views: 195
Size: 52.7 KB
ID: 304283

Click image for larger version

Name: punching.jpg
Views: 199
Size: 37.8 KB
ID: 304285

Click image for larger version

Name: punched.jpg
Views: 191
Size: 75.3 KB
ID: 304284

I cut two 6mm mild steel card shapes. I drilled all holes 9/32" and taper reamed them so the punch enters, and the cut paxolin discs exit, easily.
Five clips hold the plates together with the blank card between. This leaves space to carve the side cutout of the paxolin blank, and chamfer the corners, using the plates as a jig.
The card edges were filed to shape, tested for fit in the machine, and smoothed with sandpaper.
The punch is 9/32" silver steel, hardened, and tempered purple. The drilling machine is used as a press to punch the holes in the blank cards (with the spindle not revolving!).
The card blanks were cut from Presspahn 150 SRPB (P1 Paxolin) 0.8mm sheet. A 1220x1220mm sheet will yield 53 blanks, barring mistakes!
The material is somewhat brittle but I found it will cut by scoring and snapping, or by treadle guillotine. The edges can be sharp, especially after snapping, and needed thorough smoothing with a sanding block.
I have only punched a few cards so far, but it seems to work well enough.

David.

theredhouseinn · 3rd Dec 2024, 10:52 am

Hi Folks.
Does anyone have the hole details for an EL506 pentode. It is not listed on the MHSVT chart.
I see from the Valve museum website that it is a replacement for the 7868 USA type used in guitar, and hi fi amps.. (Fisher X-100B).
John.

GMB · 3rd Dec 2024, 2:00 pm

Sadly neither of those valves are in any Mullard list I have seen for the MHSVT.
Perhaps someone can find an almost-equivalent?

theredhouseinn · 3rd Dec 2024, 4:13 pm

The nearest valve data I can find to match the 9868 it the KT66 which I have a card for.
I have ordered a B9D valve base to make an adaptor using an old octal valve plug from a defunct valve.
There is an adaptor no. 10 in the MHSVT kit but the internal connections do not fit the KT66.
Does anyone have any other ideas?
John.

theredhouseinn · 6th Dec 2024, 4:51 pm

Hi folks.
I have made up the adaptor, and using a new 7868, the KT66 card barely lifted the spot off the red line. Next I tried 6V6 card and this was much better, lifting the spot into the top of the yellow band. I will stick with this for the time being. Of the 4 7868's in the amp 3 are showing electrode faults, 1 good one.
There are quite a lot of output valves with same pin connections, so I may try a few more when I have time.
John.

24th Dec 2023, 12:40 pm	#141
GMB Dekatron Join Date: Aug 2003 Location: near Reading (and sometimes Torquay) Posts: 3,235	Re: Mullard Valve Tester Card Project I am surprised that you have seen it as not issued as it seems to be quite common.

24th Dec 2023, 4:45 pm	#142
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,681	Re: Mullard Valve Tester Card Project Hi George,thanks for the info, it must be my listing. It also lists the 680 card as suitable Cheers, Ed

8th Aug 2024, 2:05 pm	#143
theredhouseinn Hexode Join Date: Jan 2013 Location: Kelvedon, Essex, UK. Posts: 314	Re: Mullard Valve Tester Card Project Hi folks. I am back on the job of making missing cards for my collection. I have a complete set up to 600 apart from 87 & 374. In the 600 range I am missing no's - 603,604,605,608,609,610,611,612,613,614,615,617,618,621,622,623,624,625,626,627,628,629,662,667,675, 676,677,678,679,680,681,682,684,685,686,687,688,689,690,692,694,695,696,697,698, & 699. In the 700 range I am missing no's - 700,701,702,703,704,705C,722,723,724,725,726,727,728,729,730,731,732,733,734,736,738,739,742,743,744 ,745,746,748,749,751,752,763,765,777,779,780,783,785,786,797,798, & 799. In the 800 range I am missing no's - 802,805,806,807,809,810,811,812,813,814,815,816,819,820,821,822,823,826,827,828,829,831,832,833,834, 835,836,837,838,839,840,841,843,844,845,846,848,849,851,852,853,855,856,858,859,863,864,865,866,867, 868,869,870,871,872,873,874,875,876,877,879,880,882,883,884,889,890,894,895, & 897. That will do for now. If anyone can help me with pdf templates for these cards it will be very appreciated. I will get on to the rest when I have hopefully made these. Many thanks John.

29th Sep 2024, 3:22 pm	#144
DavidM0ICZ Triode Join Date: Sep 2024 Location: Hungerford, Berkshire, UK. Posts: 17	Re: Mullard Valve Tester Card Project Here is my card punch, and how it was made and used. I cut two 6mm mild steel card shapes. I drilled all holes 9/32" and taper reamed them so the punch enters, and the cut paxolin discs exit, easily. Five clips hold the plates together with the blank card between. This leaves space to carve the side cutout of the paxolin blank, and chamfer the corners, using the plates as a jig. The card edges were filed to shape, tested for fit in the machine, and smoothed with sandpaper. The punch is 9/32" silver steel, hardened, and tempered purple. The drilling machine is used as a press to punch the holes in the blank cards (with the spindle not revolving!). The card blanks were cut from Presspahn 150 SRPB (P1 Paxolin) 0.8mm sheet. A 1220x1220mm sheet will yield 53 blanks, barring mistakes! The material is somewhat brittle but I found it will cut by scoring and snapping, or by treadle guillotine. The edges can be sharp, especially after snapping, and needed thorough smoothing with a sanding block. I have only punched a few cards so far, but it seems to work well enough. David.

3rd Dec 2024, 10:52 am	#145
theredhouseinn Hexode Join Date: Jan 2013 Location: Kelvedon, Essex, UK. Posts: 314	Re: Mullard Valve Tester Card Project Hi Folks. Does anyone have the hole details for an EL506 pentode. It is not listed on the MHSVT chart. I see from the Valve museum website that it is a replacement for the 7868 USA type used in guitar, and hi fi amps.. (Fisher X-100B). John.

3rd Dec 2024, 2:00 pm	#146
GMB Dekatron Join Date: Aug 2003 Location: near Reading (and sometimes Torquay) Posts: 3,235	Re: Mullard Valve Tester Card Project Sadly neither of those valves are in any Mullard list I have seen for the MHSVT. Perhaps someone can find an almost-equivalent?

3rd Dec 2024, 4:13 pm	#147
theredhouseinn Hexode Join Date: Jan 2013 Location: Kelvedon, Essex, UK. Posts: 314	Re: Mullard Valve Tester Card Project The nearest valve data I can find to match the 9868 it the KT66 which I have a card for. I have ordered a B9D valve base to make an adaptor using an old octal valve plug from a defunct valve. There is an adaptor no. 10 in the MHSVT kit but the internal connections do not fit the KT66. Does anyone have any other ideas? John.

6th Dec 2024, 4:51 pm	#148
theredhouseinn Hexode Join Date: Jan 2013 Location: Kelvedon, Essex, UK. Posts: 314	Re: Mullard Valve Tester Card Project Hi folks. I have made up the adaptor, and using a new 7868, the KT66 card barely lifted the spot off the red line. Next I tried 6V6 card and this was much better, lifting the spot into the top of the yellow band. I will stick with this for the time being. Of the 4 7868's in the amp 3 are showing electrode faults, 1 good one. There are quite a lot of output valves with same pin connections, so I may try a few more when I have time. John.