[AMRadio] Help..need info on Thordarson multimatch driver T15D82

[Bob Login]

Hi Bill, Thanks for info.....others are telling me that the PCCP
are for the plates of the driver pp tubes and that the xfmr has a 500 ohm
output. So I will try to run it backwards feeding in at 500 ohms and connecting
the PCCP to grids of the 813 pp class B mod....what do you think??? 73 Bob, 
AA8A



At 08:19 AM 4/24/2002 -0400, you wrote:
>In <5.0.2.1.0.20020423221617.00ab1410 at pop.mindspring.com>, on 04/23/2002
>    at 10:27 PM, Bob Login <jlogin at mindspring.com> said:
>
> >  Hi, Building a class B mod and have this driver xfmr. It says 15W
> >multimatch driver. It has plug-in jacks on its side and solder connectors
> >on the bottom  ...three are marked 500ohms A, B, C and across from them
> >are P-C-C-P terminals. The label says T15D82 or possibly 32? seems more
> >like 82....Need info on how to hook it up?   Would like to use my 32V2
> >500 ohm mod output to drive the Class B.    Thanks, Bob, AA8A
>
>Are the C-C connected together ( 00.0x ohms)? If infinity then they expect
>you to do so. Would there be any sense in adding some series resistance
>here? What is the dc resistance of P-C? Compare this to the 500 Ohms dc
>res to get a sense of the P-C impedance. You would LIKE it to be on the
>order of 3.5k each leg. This value works into my 4-125 grids push-pull. In
>other words you would like the 500 ohm imput to be upped to 3.5k ohms or
>even more.
>
>You may want to install loading resistors across each P-C winding to
>smooth out the audio (etc).
>
>It is hard to imagine that it would be a step-down transformer. Then it
>would be called a 'line' or '70.7v' transformer. Chances are you have the
>real deal. I'll have a bit of digging to find my old Thordarson brochures
>. . .
>
>Bill    K2AME
>--
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