Blog Pages

11/21/18

PULTEC EQ PROTOTYPE

Revision "A" PCB's for 2 out of 3 sections of my Pultec EQP-1A are now completed.  The 3U enclosure is from Collective Cases.com.

6X4 POWER SUPPLY

The power supply PCB was the first section to be built and tested. The DC output from the 6X4 rectifier tube is good and clean. I purchased my 6X4's from Tube Depot.com. I purchased the Hammond 270FX power transformer from Mouser Electronics.


BALANCED AMPLIFIER

The output stage of a Pultec EQP-1A is a "Balanced Amplifier Topology". A balanced amplifier operates with a "balanced input signal" and the signal remains "balanced" throughout the entire amplifier. Theoretically, a "perfectly balanced" Balanced Amplifier can significantly reduce Even-Order distortion.


TRANSFORMERS

One of the challenges of building your own Pultec EQ is deciding which transformers you would like to use. Quality transformers are not cheap. So, getting it right the first time is important. For this build, I chose a Sowter 1475e input transformer and a Cinemag CM-S217D output transformer.


PASSIVE EQ STAGE

The passive EQ stage is currently being breadboarded on my bench. I will need to create a PCB layout for it once I am finished testing. Stay tuned.

Thanks for reading,
Trenton

No comments:

Post a Comment