67233 PT

ELZEB

Joined: Aug 30, 2017
Posts: 50

Posted on Nov 18 2024 02:56 PM

Apart from the Mercury Magnetics FBLS-P, does anyone know of any other 67233 repro's/clones? Hammond claims their 290EX is a 67233 equivalent, but they list it under Bandmaster and Bassman.

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edwardsand

Joined: Jun 29, 2018
Posts: 742

Posted on Nov 18 2024 04:46 PM

I'd go by the specs needed to pick the proper Hammond PT, just to make sure. Or find a Heyboer equivalent. What kind of amp is this for?

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ELZEB

Joined: Aug 30, 2017
Posts: 50

Posted on Nov 18 2024 06:01 PM

6G14-A. Heyboer only makes them when the stars are aligned.

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terma_reverb

Joined: Apr 17, 2012
Posts: 47
Greece

Posted on Nov 19 2024 04:03 AM

I did a related research recently for my 6G14A custom build. I did not find an "official" 67233 clone other than that of MM. Hammond 290EX has the correct voltage specs but the amperes are not sufficient for the Showman. Many in this forum have used the Hammond 290FEX which seems to be the closest compatible thing from Hammond. It has slightly different voltages but I think you'll still be in the acceptable range... Personally I ended up ordering a PT with the specs of 67233 from a local handicraft which costed be about 6 times less(!) than ordering the MM from a reseller in Europe. The PT was bulkier than MM but my build was custom anyways so I just adjusted the chassis accordingly...

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ELZEB

Joined: Aug 30, 2017
Posts: 50

Posted on Nov 19 2024 04:28 AM

Thanks for the input. Terma, I'd be interested in knowing wich reseller in Europe sells the Mercury Magnetics, also about your local craftsman and if he'd be willing to ship to France. Does he have the Triad 67233 spec sheet?

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terma_reverb

Joined: Apr 17, 2012
Posts: 47
Greece

Posted on Nov 19 2024 06:52 AM

I found the PT at a reseller in Spain, which is available on request. Check here. The price however is quite high.

My local craftsman does not have the Triad spec sheet, in fact I just pointed out the specs to him after my own personal research. By saying specs, I mean just the voltage and amperage ratings. The materials, construction method and size is what he uses on a daily basis. Unfortunately he does not ship at all, he was not even willing to ship to the same country, so I just had to travel to another town to get order it and get it.

My opinion is to go for MM if you want the closest thing to the original, because "Tone Clone" supposedly clones not only the power ratings, but also the size, materials and construction technique. But, you will have to pay the price. The 290FEX may be a good trade-off between price and compatibility but the installment may require chassis mod and it won't be plug-n-play...

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ELZEB

Joined: Aug 30, 2017
Posts: 50

Posted on Nov 20 2024 02:37 AM

That's quite expensive indeed. I'm following a couple other leads and if they turn up nothing I'll take the MM route.

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RobinsonCrusoe

Joined: Aug 08, 2009
Posts: 49
Saarbruecken Germany
1 Calendar Pin

Posted on Nov 20 2024 03:54 AM

Do you use 45550 or 125A4A Output Transformer?
Pacific Transformer PAM-PT-40-15RZ (125P7A )
385-0-385 ,200ma ,50v bias.
Hammond 330-0-330 ,275ma ,53v bias.

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terma_reverb

Joined: Apr 17, 2012
Posts: 47
Greece

Posted on Nov 20 2024 05:03 AM

RobinsonCrusoe wrote:

Do you use 45550 or 125A4A Output Transformer?
Pacific Transformer PAM-PT-40-15RZ (125P7A )
385-0-385 ,200ma ,50v bias.
Hammond 330-0-330 ,275ma ,53v bias.

RobinsonCrusoe I am also really interested in this subject, can you please elaborate more on this? Have you tried any of these in a Showman? In theory at least, the specs seem to be incompatible...

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ELZEB

Joined: Aug 30, 2017
Posts: 50

Posted on Nov 20 2024 07:42 PM

RobinsonCrusoe, I use the 45268 output transformer.

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RobinsonCrusoe

Joined: Aug 08, 2009
Posts: 49
Saarbruecken Germany
1 Calendar Pin

Posted on Nov 21 2024 10:47 AM

I build a Showman 6G14-A clone with the same
45268 125A4A Tad transformer. The schematic shows
68249 export and 125P7A transformers. I want
to get as close as possible to the original amp.

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RobinsonCrusoe

Joined: Aug 08, 2009
Posts: 49
Saarbruecken Germany
1 Calendar Pin

Posted on Nov 21 2024 10:48 AM

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terma_reverb

Joined: Apr 17, 2012
Posts: 47
Greece

Posted on Nov 21 2024 04:00 PM

Cool build @RobinsonCrusoe! Indeed there is a schematic out there in which 125P7A is the PT, but the voltage difference seems quite high compared to the 67233 (385V vs 330V). In my build I've tried 320V and 330V and with 330V I got the closest plate voltage to the schematic, at 428V. With 385V you should probably be close to 500V which is still marginally acceptable, but I assume that this difference would reflect also in the tonal response of the amp. Have you take any measurements yet to give some feedback on this?

Last edited: Nov 21, 2024 16:01:44

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RobinsonCrusoe

Joined: Aug 08, 2009
Posts: 49
Saarbruecken Germany
1 Calendar Pin

Posted on Nov 22 2024 08:50 AM

Thanks. No still in build process may i try
Bf showman transformer 340-0-340 380ma.Do you
use also bassman tranny?

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ELZEB Joined: Aug 30, 2017 Posts: 50	Posted on Nov 18 2024 02:56 PM Apart from the Mercury Magnetics FBLS-P, does anyone know of any other 67233 repro's/clones? Hammond claims their 290EX is a 67233 equivalent, but they list it under Bandmaster and Bassman. — https://soundcloud.com/elzeb Top
edwardsand Joined: Jun 29, 2018 Posts: 742	Posted on Nov 18 2024 04:46 PM I'd go by the specs needed to pick the proper Hammond PT, just to make sure. Or find a Heyboer equivalent. What kind of amp is this for? Top
ELZEB Joined: Aug 30, 2017 Posts: 50	Posted on Nov 18 2024 06:01 PM 6G14-A. Heyboer only makes them when the stars are aligned. — https://soundcloud.com/elzeb Top
terma_reverb Joined: Apr 17, 2012 Posts: 47	Posted on Nov 19 2024 04:03 AM I did a related research recently for my 6G14A custom build. I did not find an "official" 67233 clone other than that of MM. Hammond 290EX has the correct voltage specs but the amperes are not sufficient for the Showman. Many in this forum have used the Hammond 290FEX which seems to be the closest compatible thing from Hammond. It has slightly different voltages but I think you'll still be in the acceptable range... Personally I ended up ordering a PT with the specs of 67233 from a local handicraft which costed be about 6 times less(!) than ordering the MM from a reseller in Europe. The PT was bulkier than MM but my build was custom anyways so I just adjusted the chassis accordingly... Top
ELZEB Joined: Aug 30, 2017 Posts: 50	Posted on Nov 19 2024 04:28 AM Thanks for the input. Terma, I'd be interested in knowing wich reseller in Europe sells the Mercury Magnetics, also about your local craftsman and if he'd be willing to ship to France. Does he have the Triad 67233 spec sheet? — https://soundcloud.com/elzeb Top
terma_reverb Joined: Apr 17, 2012 Posts: 47	Posted on Nov 19 2024 06:52 AM I found the PT at a reseller in Spain, which is available on request. Check here. The price however is quite high. My local craftsman does not have the Triad spec sheet, in fact I just pointed out the specs to him after my own personal research. By saying specs, I mean just the voltage and amperage ratings. The materials, construction method and size is what he uses on a daily basis. Unfortunately he does not ship at all, he was not even willing to ship to the same country, so I just had to travel to another town to get order it and get it. My opinion is to go for MM if you want the closest thing to the original, because "Tone Clone" supposedly clones not only the power ratings, but also the size, materials and construction technique. But, you will have to pay the price. The 290FEX may be a good trade-off between price and compatibility but the installment may require chassis mod and it won't be plug-n-play... Top
ELZEB Joined: Aug 30, 2017 Posts: 50	Posted on Nov 20 2024 02:37 AM That's quite expensive indeed. I'm following a couple other leads and if they turn up nothing I'll take the MM route. — https://soundcloud.com/elzeb Top
RobinsonCrusoe Joined: Aug 08, 2009 Posts: 49 Saarbruecken Germany	Posted on Nov 20 2024 03:54 AM Do you use 45550 or 125A4A Output Transformer? Pacific Transformer PAM-PT-40-15RZ (125P7A ) 385-0-385 ,200ma ,50v bias. Hammond 330-0-330 ,275ma ,53v bias. Top
terma_reverb Joined: Apr 17, 2012 Posts: 47	Posted on Nov 20 2024 05:03 AM RobinsonCrusoe wrote: Do you use 45550 or 125A4A Output Transformer? Pacific Transformer PAM-PT-40-15RZ (125P7A ) 385-0-385 ,200ma ,50v bias. Hammond 330-0-330 ,275ma ,53v bias. RobinsonCrusoe I am also really interested in this subject, can you please elaborate more on this? Have you tried any of these in a Showman? In theory at least, the specs seem to be incompatible... Top
ELZEB Joined: Aug 30, 2017 Posts: 50	Posted on Nov 20 2024 07:42 PM RobinsonCrusoe, I use the 45268 output transformer. — https://soundcloud.com/elzeb Top
RobinsonCrusoe Joined: Aug 08, 2009 Posts: 49 Saarbruecken Germany	Posted on Nov 21 2024 10:47 AM I build a Showman 6G14-A clone with the same 45268 125A4A Tad transformer. The schematic shows 68249 export and 125P7A transformers. I want to get as close as possible to the original amp. Top
RobinsonCrusoe Joined: Aug 08, 2009 Posts: 49 Saarbruecken Germany	Posted on Nov 21 2024 10:48 AM Top
terma_reverb Joined: Apr 17, 2012 Posts: 47	Posted on Nov 21 2024 04:00 PM Cool build @RobinsonCrusoe! Indeed there is a schematic out there in which 125P7A is the PT, but the voltage difference seems quite high compared to the 67233 (385V vs 330V). In my build I've tried 320V and 330V and with 330V I got the closest plate voltage to the schematic, at 428V. With 385V you should probably be close to 500V which is still marginally acceptable, but I assume that this difference would reflect also in the tonal response of the amp. Have you take any measurements yet to give some feedback on this? Last edited: Nov 21, 2024 16:01:44 Top
RobinsonCrusoe Joined: Aug 08, 2009 Posts: 49 Saarbruecken Germany	Posted on Nov 22 2024 08:50 AM Thanks. No still in build process may i try Bf showman transformer 340-0-340 380ma.Do you use also bassman tranny? Top

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67233 PT