Author Topic: WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]  (Read 1469 times)

Offline acobaugh

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Hey folks! Time to thin out my workshop. I am trying to off-load some of the larger/heavier Tesla-related items that I have collected over nearly 2 decades of building Tesla coils and related HV experiments. Going forward, nearly everything I do will be solid state.

If there is no price listed, make me an offer. You either pick up or pay for shipping, and possibly arrange for shipping if it's a larger item. Not inclined to ship anything over 100lbs or so. Happy to work with potential buyers to get things to you if it gets it out of my shop!

You must be 18 or older to purchase the pole transformer or any of the PTs.

All items located in central PA.


Photos of everything: https://photos.app.goo.gl/JXQoXigjFwt334kt8


(1) 15kVA 7200V single-ear pole transformer - $300 OBO

(2) 3kVA 18.6KV GE type JVT-150, 155:1 - $200 each, OBO. I have 3, keeping 1 for myself.

(1) 1.5kva 7200V single-ear PT, GE type JVM-5, 60:1 - $75 OBO

15kVA 3-phase step up/down transformer. 415V to 240V star/delta (see pictures) - make offer

Transco 9/30 NST. $25

Franceformer 7.5/30 NST. $25

(4) Luxtrol variacs. Removed from an old-school theater lighting dimmer. Model D1200P, 10A, 120V. - make offer

(1) Luxtrol 15MD2060 120V 16.7A variac. Frame has a crack in it, but mechanically and electrically it works. $35 OBO

(1) 3-phase 460V to 2670V transformer. Was the power supply for a large quad-pentode transmitter. - make offer

(1) General Radio Type W30H 240V, 12A variac. $50 OBO

GE Type 30F DC filter caps. Would like to get $15 each, OBO.
(2) 10kvdc 3.3uF
(1) 10kvdc 5uF
(1) 10kvdc 13uF
(2) 5kvdc 46uF

120BPS SRSG. 3600RPM teletype motor. Base needs to be rebuilt (MDF has deteriorated over time). This worked well up to a couple kva for short runs. Copper plating on the PCB material used for the rotor started to peel at higher power. Would like $100, OBO.

Tektronix 5110 mainframe scope with 5A18N dual trace amplifier, 5A15N single trace amplifier, 5B10N time base. Probes pictured not included. $75

Misc MOTs. Free to good home if you pay shipping. Otherwise they'll be scrapped.

Offline paulj

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Re: WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]
« Reply #1 on: February 16, 2021, 03:00:18 PM »
Hello, is your synchronous teletype rotary spark gap still available?
you can send me a private message.

Regards, Paul.

Offline acobaugh

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Re: WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]
« Reply #2 on: February 16, 2021, 06:54:51 PM »
So I actually had two of these motors, but one of them was already built into a small SRSG. I have since sold the standalone motor, and I had one other person express interest in the remaining motor just the other day. Waiting to hear back about that deal.

Where are you located? I have lots of other spark gap coil stuff I'm trying to get rid of. I've kept that linked photo album updated as things have come and gone. At this point I'm getting out of spark gap coils entirely, and I'm planning a move in the future, so all the old heavy iron has to go!

Offline paulj

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Re: WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]
« Reply #3 on: February 16, 2021, 08:05:20 PM »
I live in France, real synchronous motors are hard to find in this country.
Don't bother if it's too far, you can refuse shipments abroad

Keep me informed .

Paul.
« Last Edit: February 16, 2021, 08:06:55 PM by paulj »

Offline acobaugh

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Re: WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]
« Reply #4 on: February 16, 2021, 08:12:16 PM »
Hah, yeah, US to France shipping on something like this would probably be prohibitive. Just keep watching ebay or try hand filing flats on an existing induction motor. The way I would do it is use some calipers to scribe a line that you want to file to, then clamp some hardened steel file guides to either side of the rotor, then file until you hit those guides. If you're precise enough with it, the balance shouldn't be too bad, or can be compensated for when you balance the spark gap disk with the rotor as an assembly.

Offline paulj

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Re: WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]
« Reply #5 on: February 16, 2021, 08:16:18 PM »
yes, but I would really like to use a real synchronous one rather than starting such an operation.
Good day to you,I'll find it in the end. 8)

Offline klugesmith

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Re: WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]
« Reply #6 on: February 16, 2021, 08:53:49 PM »
... try hand filing flats on an existing induction motor...
An easy and stronger alternative was presented and widely acclaimed on 4hv forum about 10 years ago.
Someone electrically modified a series connected universal motor, as from a vacuum cleaner.
Added rectification to the armature, soldering a diode between two opposed commutator segments, and another diode in parallel (on opposite side) for mechanical balance.  Glued and tied to resist centrifugal force.
The resulting motor started and ran at synchronous speed, with reduced AC voltage.
Who today can give us a link or a name?

[edit] All hail Mr Clive Penfold !
https://4hv.org/e107_plugins/forum/forum_viewtopic.php?102515

« Last Edit: February 17, 2021, 03:59:50 AM by klugesmith »

Offline paulj

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Re: WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]
« Reply #7 on: February 18, 2021, 08:18:28 AM »
thank you for the 4hv link .

Offline Skeluroth

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Hello,
if you haven't scrapped them already, I would be interested in some MOTs. How much would shipping to germany be?

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