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Old 7th January 2014, 03:17 PM   #1
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Default Vendetta Research TPC-1

hello chaps

i certainly hope that this is the correct forum for this.
in any case, i was wondering; for those of you that are familiar with John Curl's TPC- 1 phase coherent electronic X- over, if there was anyone out there that was doing upgrades. i purchased mine back in the 80's when i lived in the UK and other than changing the power supply it has performed very well. but i do believe that after thirty years that guts could probably use a change out for the more modern caps, resisters, etc. im not an EE (just a retired fighter pilot).
ive searched the web as best as i could, but i seem to get no where. so here i am asking for your help. i want to be able to use this X- over with my newest tube products (pre/power amp) and when i do i notice a distinct change in soundstaging (negatively) from the high pass. hence my thought that maybe the old vendetta needs some new shoes.
if anyone knows anything; your comments would be GREATLY appreciated

thank you in advance
lance
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Old 7th January 2014, 03:20 PM   #2
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Hi f16, DON'T TOUCH ANYTHING, (except the power supply) It is all first rate stuff, even today.
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Old 7th January 2014, 03:58 PM   #3
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oh my is this the honorable john curl himself..???? wow what an honor SERIOUSLY.
can u give me exactly what power supply i should be using.. much appreciated.because i'll get one. i could not find the brand on your original

thank you
lance
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Old 7th January 2014, 04:03 PM   #4
brianco is offline brianco  Ireland
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A possible problem is that your hearing is not now as good as it once was; there is little you can do about that other than be aware of its true state.

I suggest that everyone over say 45 years of age has a full hearing test, especially those who have spent time in high noise environments.

It would be well worth having the power supply components brought up to full spec as JC infers above. But do use high quality modern equivalents.

EDIT:

HAving now seen your response to JC's post, I would suggest that you take the items to a really good repair shop and let them replace the off spec components in the existing power supply.

Last edited by brianco; 7th January 2014 at 04:06 PM.
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Old 7th January 2014, 04:10 PM   #5
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Originally Posted by brianco View Post
A possible problem is that your hearing is not now as good as it once was; there is little you can do about that other than be aware of its true state.

I suggest that everyone over say 45 years of age has a full hearing test, especially those who have spent time in high noise environments.

It would be well worth having the power supply components brought up to full spec as JC infers above. But do use high quality modern equivalents.
i agree wholeheartedly ( btw i get one every year and of course you are correct) i just need the info on exactly what power supply and the polarity on the tpc- 1 wires

thanks
lance
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Old 7th January 2014, 04:22 PM   #6
brianco is offline brianco  Ireland
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All you should need is to have the EXISTING power supply checked out and have any degraded components replaced with new......it is really just a full servicing of what you already have.

BUT do make sure you use a reputable repairer.
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Old 7th January 2014, 06:04 PM   #7
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Actually the original power supply is OK, and it is difficult to change. I would just clean the connectors, make sure that the wall transformer is of adequate size (24Vac), and you get the best of this unit. IF you are not technical, you don't have to change anything, just clean it up.
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Old 7th January 2014, 06:15 PM   #8
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You are in luck, I found a long lost schematic for the xover.
Attached Images
File Type: jpg ven Xover.jpg (542.5 KB, 126 views)
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Old 7th January 2014, 07:03 PM   #9
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thank u thank you thank YOU
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Old 7th January 2014, 07:33 PM   #10
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Quote:
Originally Posted by john curl View Post
Actually the original power supply is OK, and it is difficult to change. I would just clean the connectors, make sure that the wall transformer is of adequate size (24Vac), and you get the best of this unit. IF you are not technical, you don't have to change anything, just clean it up.
ah ha i knew it was something. recently i changed out the original wall transformer ( the plug was horrendous) i tried to match the it up and all i could read on it was what i thought to be 12V. WELL : now i'll get a 24VAC wall adapter . wow i sure hope i didnt do any damage

again thank you SIR
lance
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