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Anyone around from anywhere near Yorkshire?
In on 8 Nov 2009 10:25:49 -0500, in
rec.radio.amateur.boatanchors, 'Scott Dorsey' wrote: If you (or anyone else for that matter) are sufficiently curious, there are some beautifully clear pics, from several angles, large and clear enough to read the function of each control at http://digilander.libero.it/pasqua49...ic%20meter.htm or, to avoid word-wrap hassle, at http://tinyurl.com/AvoMkIV This looks like a conventional transconductance tester. It's what you would expect your local TV repair shop to have for testing tubes. Heh, I suspect there may be an inappropriate tense in there grin. It's not a fancy design tool like a curve tracer, and _because_ it's a fairly common service tool, you shouldn't have any problem selling it. Ok. From my amateurish POV it *looks* quite fancy :-) If it measures characteristics of which I have only the faintest working knowledge then by my standards it's complex enough. If the 'curve tracers' you mention are the sort of tool I imagine from the name then in those (pre d - a / computer) days they must have been beautiful designs. Thanks for the reply anyhow, I suppose it's ebay or nothing. I'm not aware of any antique-radio magazines in the UK or I'd consider advertising it there. It's worth enough to make for a fractionally improved Christmas :-) Ask your local ham radio club. Someone there is apt to want one. Also try guitar shops. Hadn't thought of a guitar shop, though I'm surprised your average guitar amp's all that fussy WRT valve specification? I'd have imagined more the sort of pass/fail testing I'd cobble together as a psu/pot/avo birds-nest on my workbench. Any extra idea's worth a try though, thanks muchly. -- Dave Johnson |
#2
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Anyone around from anywhere near Yorkshire?
Dave J. wrote:
If it measures characteristics of which I have only the faintest working knowledge then by my standards it's complex enough. What makes it complex is the fact that tubes all have different pinouts. There are three or four controls on there that set voltages and loading for the tube, and the rest of the controls just are for selecting the pinout. If the 'curve tracers' you mention are the sort of tool I imagine from the name then in those (pre d - a / computer) days they must have been beautiful designs. The curve tracer is basically a device like what you have, except that it makes one parameter adjustable and displays a plot on a CRT of the plate current with respect to that parameter. Some of them make two parameters adjustable and display a family of curves. Anything you can do with a curve tracer you can also do by hand with a transconductance tester like you have, and a sheet of graph paper, and a lot of labour making individual measurements and plotting the curve. The transconductance tester is normally used for simple go/no go tests, and for matching tubes based on their plate current at a single point in the curve. Thanks for the reply anyhow, I suppose it's ebay or nothing. I'm not aware of any antique-radio magazines in the UK or I'd consider advertising it there. It's worth enough to make for a fractionally improved Christmas :-) Ask your local ham radio club. Someone there is apt to want one. Also try guitar shops. Hadn't thought of a guitar shop, though I'm surprised your average guitar amp's all that fussy WRT valve specification? I'd have imagined more the sort of pass/fail testing I'd cobble together as a psu/pot/avo birds-nest on my workbench. The guitar shops usually aren't too worried about that, but everyone would rather have nice test equipment than poor test equipment. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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Anyone around from anywhere near Yorkshire?
In on 10 Nov 2009 09:45:09 -0500, in
rec.radio.amateur.boatanchors, 'Scott Dorsey' wrote: Dave J. wrote: If it measures characteristics of which I have only the faintest working knowledge then by my standards it's complex enough. What makes it complex is the fact that tubes all have different pinouts. There are three or four controls on there that set voltages and loading for the tube, and the rest of the controls just are for selecting the pinout. If the 'curve tracers' you mention are the sort of tool I imagine from the name then in those (pre d - a / computer) days they must have been beautiful designs. The curve tracer is basically a device like what you have, except that it makes one parameter adjustable and displays a plot on a CRT of the plate current with respect to that parameter. Some of them make two parameters adjustable and display a family of curves. Anything you can do with a curve tracer you can also do by hand with a transconductance tester like you have, and a sheet of graph paper, and a lot of labour making individual measurements and plotting the curve. The transconductance tester is normally used for simple go/no go tests, and for matching tubes based on their plate current at a single point in the curve. Yes, that sounds close to what I was picturing. Perhaps a LF oscillator providing input(s) and a synchronised scope as a readout? These days I imagine you'd produce a reasonable semblance by knocking up a two way interface between a sound card and some breadboarded testkit? Although preferably with a decent linear opto-isolator somewhere in between A PC makes quite a handy substitute for an audio 'scope. I'm slowly meandering toward digging up the right 'back to basics' video capture card to give me something that'll work at lowish RF. (maybe a few MHz) My lifelong love of the tinkering perpetually exceeds my budget by a couple of orders of magnitude.. ;-{ [..] Hadn't thought of a guitar shop, though I'm surprised your average guitar amp's all that fussy WRT valve specification? I'd have imagined more the sort of pass/fail testing I'd cobble together as a psu/pot/avo birds-nest on my workbench. The guitar shops usually aren't too worried about that, but everyone would rather have nice test equipment than poor test equipment. Bit expensive for a pass/fail piece of kit I'd have thought. Although, I s'pose it'd be one of those investments that won't drop in value too quickly . Thanks and apols for time-warped reply Dave J. |
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