Trying to kludge an eqp1 filter into a Neve o/p stage.

[Rob Flinn]

Hello I'm trying to finish a project I started a long  time ago which is an eqp1a using Franks enhanced pultec boards.  This has been sat on the shelf for a while, mainly because I was procrastinating over what to do about the make up amp.  I was digging around & found 2 neve BA283 output stage only boards from Fabio that I have had years.  I figure I could use them because I have most of the bits lying around.

I was going to use a pair of Gardeners 600:600 transformers in the i/p.  My question is do I need a transformer between the filter & make up amp.  I have included a PDF of Fabios board.    Is the 10k pot on the input too low & would it load the filter in a nasty way,  or actually needed at all ? 

 

[electric_diaries]

do I need a transformer between the filter & make up amp.

no

Is the 10k pot on the input too low & would it load the filter in a nasty way,  or actually needed at all?

THIS page might be of interest to you. Steffen used a discrete makeup stage which appears to have a somewhat similar input impedance as your BA283. On his schematic he wrote that he used a 50k pot because he “found out the hi boost sounds sweeter when the eq-network is less loaded”. It should also work well without the pot.

 

[Rob Flinn]

Thanks, I already saw that.  I was thinking of subbing in a 50k pot for that reason.