I've seen that, and pondered it a bunch. Then wondered if I'd really want to cut up and old Tek scope. But reality is I've got a bunch of these around and we're unlikely to be the folks who'd say the tube scopes work better than the SS scopes, so...
I couldn't even tell you the model numbers of the ones I've got right now, just because they've been in storage for a few years.
your torch or mine? 
on a more serous note though, there is still plenty of tek tube stuff still floating around. if your scopes were worth placing back into service, would you have not done so by now? just something to ponder... i'd love to have a copy of the iron, if just for anything would be to have it cloned by edcore or heyboer so we don't have to gut anymore old tek gear than necessary. i'm scouring ebay now for a tek 535 carcass... no luck so pfar, only a functional unit for more that i care to spend... 
Well, after some checking, it seems I have a pair of Tek 533's, a 532, a rackmount 506, and a couple of others. The rackmount unit is probably the most likely candidate for the torch, as it is huge and the rackmount format means it takes up way too much space on a bench top. Somewhere, I have manuals for a few of these, which will also spell out the voltage and current ratings for each tap on the power transformer. They are also available free posted on the net in various places.
So maybe we can come up with something after all.
The big question in my mind is whether it is smarter to use tubes for pass elements in a regulated power supply, or whether the switch should be made to MOSFETs. To use tubes, you generally want pentodes or beam power tubes, because using triode pass tubes would require more voltage dropped across the tubes, which leaves less for the output voltage. And the typical pentode/beam pass tubes (EL34, 6L6, EL37, 6550, etc) are ones we'd want to save for actual amp projects...
ok then, if you have just the one copy of the 506 PT, looks like a custom wind might be track to follow - from past experience, i do believe that edcore would provide a quicker turn-around than heyboer - i'd like to submit a design request/quote if we can come to a consensus on what to use - more on that below.
some in-line research - i found the 533 manual at bama.com - the 506 isn't listed... is the 506 the rack-mount version of a bench-top such as the 504 perhaps?
http://bama.edebris.com/manuals/tek/533/ looking at his schematic again and the tek transformer data on his URL (link below) it seems as though the 533 PT won't provide the 500mA desired - don't know about the 506 PT. if i were to request a custom build, is it safe to assume the winding table below for the secondaries is reasonably correct?
http://www.pmillett.com/Tek_xfmrs.htm 360V RMS @ 600mA for the plates (i bumped it +100mA)
195V RMS @ 150mA for the bias and V reference supplies.
180V RMS @ 230mA for the screens (deleted if MOSFETs used)
6.3V RMS @ 6A for the 807 bank filaments. (deleted if MOSFET's are used)
6.3V RMS @ .5A for the error amp filament.
6.3V RMS @ 6A for user filaments.
6.3V RMS @ 6A for user filaments.
we could toss in a 5V 3A for tube recto.
the above could also be split up into 2 or more transformers if it will save $.
...switch should be made to MOSFETs.agreed, as it would reduce the complexity considerably, e.g. screen PS & 807 heater secondaries not needed. on the other hand, would we not need to redesign the error amp?
i do have some 807's and sockets i've been stashing for this very project with access to more if you're interested. if we do go with MOSFETs, we'll need a fairly hefty heatsink and make adjustments to the original layout. should we decide to stick with the plan unmodified, in regards to the 807's, what are your feelings about adding cathode fuse to each 807. and finally on the 807 subject, it seems as though there are russian 807 tubes available and there seem to be plentiful supply of them.
as far as the front panel and chassis lower go, if we follow pete millett's design, and you don't mind copying (he doesn't mind if we do so), then i'd be willing to machine a pair of each of the front panels, chassis lowers, and turret boards on my CNC machine. buttery may chime in and join the party, so three copies would be about all i could stand to mill in one run since my machine is pretty slow.
thoughts?
Topic: Tektronix 515A scope (Read 14907 times)