Simple EQ for Neve 1290

[Spencerleehorton]

Sorted the problem with 360hz, I had a wrong gnd connection to the start of the of the 2H!!
Waveform all good now, levels through the channels is much better and about 0.5v out which could just be I’ve used a OEP txf on one channel as I’ve run out of 0.1mm to wind another txf.
Another problem I had on my previous builds with the 1290s is the main psu and I kept blowing the 317s on the 48v, so will tweak the Psu for adjustable TL783.

 

[Spencerleehorton]

Eq sounds amazing!! Absolutely transforms the sound into a better workable sound! !!
Just need to build another 14 channels!!!!

 

[Spencerleehorton]

Finally got my stereo 1073 going fully, channel 2 does seem a little low on output?
Just can’t seem to get the level up to same level as channel 1?
Will I have to match all transistors!!!!?

might just look at the amp on BA283 and try to match that with the other channel!!!

 

[Spencerleehorton]

Anyone have a good gain matching way?

Match hfe on transistor on gain amps on ba283 worth doing?

I’m about 3 clicks down on level on one channel, both transformers check pretty much the same along with output txf?

My test scope has been down but rebuilt computer so should be able to get great results now!!