original crt in Deith Leisure built 90s Midway Cab

[yoganuggy]

Have an odd one here. 1996 Deith Leisure midway cab.

Think MK3, WWF, NBA Hangtime, Open Ice etc.

It was sold non-working however it was actually fine. The previous owner looks to have installed a 25k K7500 chassis but obviously the 15k game doesn't display.

For now I have put in a groovymame/emudriver pc set to 25k and it's running, but I'd love the get the original PCB running.

For that I need to put in a 15k chassis. Does anyone have a cab like this to check what chassis was in it originally?

I suspect it was a K7000 as the metal base plate of the original chassis is still in the cab and is identical to the base metal plate on the base of the K7500.

The tube is an RCA A63ADT10X05

yoganuggy2022-11-20 22:27:36

 

[Retroman839]

Mk, nba is 24 kHz medium Rez
So sounds like your chassi is ready for the correct pcb?Retroman8392022-11-21 08:02:05

 

[gunblade]

if you wanted to replace the chassis then i would suggest a k7400 or u5000

 

[yoganuggy]

Thanks all. I'm sure the midway pcb is in 15k mode as it plays fine in a xenon cab. There may be a dip switch for 24k like the naomi?

Will go through the chassis stash and look for a WG k7400 and u5000. Thanks for that. Although I'm pretty sure all I have left are hantarex and nanao's.

 

[gunblade]

I expect a polo 2 15k or auto will run on that tube although with some connector replacement

 

[antray84]

This isn't much use but I had a wwf wrestlemania cab. I can't remember the model number but I remember it was the same as another model but had a fan on it. So it was giving different end digits. MTC something something I think. It's all a bit vague. 9050 maybe? Is that a model number?.

 

[gunblade]

This isn't much use but I had a wwf wrestlemania cab. I can't remember the model number but I remember it was the same as another model but had a fan on it. So it was giving different end digits. MTC something something I think. It's all a bit vague. 9050 maybe? Is that a model number?.

hantarex mtc9110, that would need an iso transformer

 

[antray84]

yep what Gunblade said. 99% sure that was it. It was super dirty looked like it had never been removed or replaced.

 

[yoganuggy]

Thanks all.

I had a rummage through the old chassis box a found a mtc9110 plus a polo and a polo2.

The cab doesn't have an isolation transformer so I guess deith leisure changed from hantarex crt's at some point.

The polo2 seems the best option since that doesn't need an iso either. Problem is the hantarex connectors are different as gunblade says. I could make up the connectors and it would be great to have autoswitching 15k/24k for groovymame too.

Unless anyone wants to trade a polo2 chassis for a k7400?

 

[yoganuggy]

Before I try install a hantarex, would anyone know the best option out of these?

Some of the chassis have labels saying what Tubes are compatible and they require different resistors values. Unfortunatley "RCA A63ADT10X05" tube in the cab is not listed for any but maybe it's compatible anyway?

Chassis #1
Hantarex POLO 28. That's the only identifying mark on it.

Neckboard label just says "POLO".

Was hoping to keep this one spare for my Duet cab.

Chassis #2:
Hantarex POLO/2 25/28 15/25Khz

Label on back of neck board says:
A59ECY13X01 & A66ECY13X01 = R35 4R7 7W; R119 1R2 1/2W; R2 NOT ASSEMBLED
A59EAK552X11 & A66EAK552X11 = R35 10R 7W; R119 R82 1/2W; R9 39K 1/4W

Also has a label showing what jumper plug to connect for 15k vs 25k.

Chassis #3:
Hantarex POLO/2 25/28 15/25Khz

Label on back of neck board says:
A59ECY13X01, A59EHJ43X01, A66ECY13X01, & A66EHJ43X01 = R35 5R6 5W; R119 1R2 1/2W; R2 NOT ASSEMBLED
A59EAK552X11, A59EMZ43X07, A66EAK552X11 & A66EMZ43X07 = R35 12R 4W; R119 R82 1/2W; R9 39K 1/4W

Sticker on heatsink says AUTO

Seems similar to Chassis #2 but the neckboard label implies it supports more Tubes and has some different resistor values for R35 depending on what tube is used.
Plus it looks to be auto switching 15/25k.

Chassis #4
Hantarek Polo/2 28 STAR

No label on neck board.

Chassis #5

"Intervideo" with label on the main heatsink: "Mod 28 Dual Frequency type A66EHJ13X01"

Would any of these be compatible and if so do I need to do some resistor mods as implied by the neck board label on some of them?

yoganuggy2022-11-27 16:38:47

 

[yoganuggy]

Measured this on the RCA A63ADT10X05 tube:

Horizontal (Green/yellow) 5.5 ohms

Vertical (Blue/Red) 1.6 ohm

From research it seems the original polo (chassis #1 above) is the closest match. Is is ok to use even though the chassis says 28 inch and the tube is 25 inch?

Thank you!!

yoganuggy2022-11-27 21:46:31

 

[gunblade]

the polo 2 auto and intervideo are closest match, you could try the polo 28 but you may need to mod the vertical circuit - its just a resistor

polostar is nowhere near close on the yoke

you may need to change the heater resistor if pic is too dark or too bright

25" and 28" are basically the same

 

[yoganuggy]

Thanks gunblade.

If I go with the "polo2 auto" (Chassis #3 above) do I need to do anything with the R35, R119 etc as written on the next board label?

 

[gunblade]

you won't know until you test it

 

[M K L]

The tube is an RCA A63ADT10X05

This tube is used in the US version of the Hantarex Polo (Google or search the KLOV forums for confirmation). The vertical deflection coil is a bit lower than on the European Polos so there are a few resistors in the vertical circuit that have different values:

In the horizontal deflection the S-correction cap C170 is 330nF (vs 390nF of EU Polos with Videocolor tubes). R233 is 100K (vs 220K). R35 (heater) on the neckboard is 0.75 ohm (vs 0.68).

But the major difference is that this tube is pincushion free so the US Polo chassis don't have the east-west module fitted. If you can't reduce the overcorrection (barrel effect) to acceptable levels by dialing down the pincushion pot, you can desolder the pin that brings 25V to it (easier than desoldering the EW module altogether).

 

[yoganuggy]

Thanks folks. Some super information here. Really appreciate all the feed back.

It looks doable but to be honest I'd rather not mod any of my spare (European) polo chassis unless it's a last resort.

I'm 99.99% sure the original chassis was a Well Gardner type as the jamma loom connector for Red/Green/Blue and Sync is the connector type for Well Gardner.

I actually bought a cheap 25 inch K7000 chassis from USA this morning and a cap kit to try but not sure if that is a match for the A63ADT10X05 either. (Gunblade mentioned the original chassis was likely a WG K7400 or u5000 but unfortunately I couldn't find any of these for sale anywhere).

 

[M K L]

25" K7000 are pincushion free also and the vertical deflection coil is in the same range as that of your tube so it should be a good match.

 

[yoganuggy]

The K7000 chassis arrived this morning. 1st problem is there is a warning label saying it needs an isolation transformer. 2nd problem is the remote board is snapped in half - probably why it was cheap.

Before I go looking into this further, I had another thought: Since the K7400 and K7500 look identical to the untrained eye, is there anyway to convert the K7500 I have to a K7400 and output 15K standard res?