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Old 27th Jun 2020, 1:30 pm   #21
Radio Wrangler
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Default Re: Vortexian 50:1 SUT required or similar

From a point of view of signal loss in cables with low impedance microphones like ribbons, the best place is up by the microphone, not in the amplifier.

David
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Old 27th Jun 2020, 1:35 pm   #22
GrimJosef
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Default Re: Vortexian 50:1 SUT required or similar

Stepping up closer to the mic might be better for signal-to-noise too, although that can be a 'swings and roundabouts' situation. There is something to be said for distancing the SUT from the amp's great big mains transformer.

I have a Vortexion Super 50 but it's the later version, like the ones in this thread https://www.vintage-radio.net/forum/...ad.php?t=27366. Mine has a high impedance mic input and no SUT.

Cheers,

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Old 27th Jun 2020, 2:08 pm   #23
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Default Re: Vortexian 50:1 SUT required or similar

Thanks GJ
I saw that thread but as you mentioned it's a completely different setup to mine. On the base are I think two transformers or one for the mic the can type could be a choke plus the more amp board on the rear is also missing which would have linked into the mic circuit although the rectifiers do have something to do with it. I think that 3rd valve with top cap is also a rectifier but not sure what?
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Old 27th Jun 2020, 2:25 pm   #24
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Default Re: Vortexian 50:1 SUT required or similar

Of the two cylindrical cans underneath, the one nearest the 807s is the drive transformer for them. It's a centre-tapped auto winding. One end (and one 807 grid) is fed directly from the previous stage, the centre-tap is fed to the DC bias supply and the other end of the winding feeds the other 807 grid - what you might call 'crude but effective' . The circuit (or at least most of it) is currently shown in one of the later images here https://www.ebay.co.uk/itm/VORTEXION...S/143637003357 but this may evaporate when the listing ends.

I think the other cylinder may contain a small smoothing choke. There are just two wires leading out of it. They go to the paxolin tagboard at the rear which looks like it carries the components for the 807s' DC bias supply.

Cheers,

GJ
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Old 27th Jun 2020, 2:51 pm   #25
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Default Re: Vortexian 50:1 SUT required or similar

Ha ah beat ya to the post there GJ already got him to do me a copy of the spec sheet, parts list and some other info.
But thanks and very much appreciated.
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Old 27th Jun 2020, 3:08 pm   #26
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Default Re: Vortexian 50:1 SUT required or similar

I did think about it, but the circuit of mine is somewhat different. As well as having no SUT it also uses both halves of the ECC82, has a full-wave rectifier and voltage divider for the bias, has switched resistors rather than a pot for the Treble and Bass controls and has a different output transformer. So when I get a proverbial round tuit I'll have to trace the circuit out anyway.

However if you fancied copying the docs across to me then I would appreciate it . (The web link at the foot of each of my postings lets you find my e-mail.)

Cheers,

GJ
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Old 27th Jun 2020, 3:20 pm   #27
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Default Re: Vortexian 50:1 SUT required or similar

The visible rectifier looks like a 5Z4G by its marking, but that's a bit of a lightweight for feeding a pair of 807s. Maybe the other bottle betweenn the mains transformer and 807 is another 5Z4? perhaps they're using one 5Z4 with anodes strapped for each phase of the HT winding? It might be an efficient fit for the HT voltage and current they're using if they don't need the higher voltage rating of the 5R4.

Always thought Vortexion was a great name!

David
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Old 27th Jun 2020, 3:20 pm   #28
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Default Re: Vortexian 50:1 SUT required or similar

Yeah that's fine I'm waiting on them being posted. He put another 2 up for sale thinking I'd be interested but parts are not what I need different setup.
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Old 27th Jun 2020, 3:29 pm   #29
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Default Re: Vortexian 50:1 SUT required or similar

Yes I have a 5U4G, 5Z4G and the valve with top cap missing I think is a triode poss 6F5G? It's also running 4 although I only have two are 6J5WGTs I was thinking on the original 6J5 valves.
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Old 27th Jun 2020, 3:33 pm   #30
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Default Re: Vortexian 50:1 SUT required or similar

Mine's got a 5Z4G for the small signal valves and 807 screen grids and a U52 for the 807 anodes. The 5Z4 runs off tappings on the HT secondary winding, the U52 off the whole thing.

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Old 29th Jun 2020, 8:42 pm   #31
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Default Re: Vortexian 50:1 SUT required or similar

Guys any ideas what this can is where top cap of valve is connected to plus all leads coming from it.
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Old 29th Jun 2020, 9:02 pm   #32
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Default Re: Vortexian 50:1 SUT required or similar

A step-up transformer? Les
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Old 29th Jun 2020, 9:18 pm   #33
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Default Re: Vortexian 50:1 SUT required or similar

Thanks Les any ideas what type not seen one in a can before like this the valves anode connects to it via the cap?
Cheers Chris
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Old 29th Jun 2020, 10:00 pm   #34
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Default Re: Vortexian 50:1 SUT required or similar

On a small signal octal base "GT" style valve, the top cap is most likely to be control grid rather than anode.
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Old 29th Jun 2020, 10:03 pm   #35
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Default Re: Vortexian 50:1 SUT required or similar

Valves grid der connects to it.
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Old 29th Jun 2020, 10:17 pm   #36
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Default Re: Vortexian 50:1 SUT required or similar

Maybe its an American surplus type. Any info on the can? It seems this amp has had few mods done to it. Perhaps its performance was improved as far as a previous owner was concerned. Les
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Old 29th Jun 2020, 10:28 pm   #37
cdm1christopher
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Default Re: Vortexian 50:1 SUT required or similar

No the super 50 had this setup in their first vortexion think 1946 the grid of valve via top cap was connected to that can. Pic of mine with valve missing and the can missing attached. Why asked not sure of spec of it.
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