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PostPosted: Sat Sep 23, 2017 10:37 am 
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Mark III

Joined: Sun Mar 06, 2016 10:38 am
Posts: 240
Location: Western Colorado
Hey guys, trying to learn something here. My 105 PT in my IIC+ runs 515 PV. What I want to know is, what other Marks had transformers that ran that hot voltage? I've heard some of the Coliseums did but I don't know which or what to look for. Thanks!


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PostPosted: Sat Sep 23, 2017 9:57 pm 
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Dual Recto

Joined: Tue Feb 07, 2006 11:21 pm
Posts: 2833
Location: North Alabama C+ Mafia-Kingpin
I do not know why your 105 PT is reading that much voltage. Are you measuring it at pin #3 with the tubes out of the sockets? It should be around 485v. The Coliseums will push around 530V if I remember correctly.

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PostPosted: Sat Sep 23, 2017 10:58 pm 
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Mark III

Joined: Sun Mar 06, 2016 10:38 am
Posts: 240
Location: Western Colorado
I have a bias probe tool that sockets between the valve & the chassis & runs leads (through a shunt) to a DVM. When I mentioned the voltage to Mike B. he didn't bat an eye. Is what it is I guess.

Does anyone know if all Colis got hot transformers?


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PostPosted: Sun Sep 24, 2017 6:41 am 
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Dual Recto

Joined: Tue Feb 07, 2006 11:21 pm
Posts: 2833
Location: North Alabama C+ Mafia-Kingpin
GJgo wrote:
I have a bias probe tool that sockets between the valve & the chassis & runs leads (through a shunt) to a DVM. When I mentioned the voltage to Mike B. he didn't bat an eye. Is what it is I guess.

Does anyone know if all Colis got hot transformers?


Touch your DVM to pin#3 on the PCB trace on the tube socket, and see what you get. That will tell the real story.

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