MEQ-5 Layout Review

[jimfowler]

Anybody see anything glaringly wrong here?  It's my first non-pcb project...if it doesn't catch on fire I'll consider it a success.

- Jim

 

[jimfowler]

Another pic.  Filter section is not hooked up yet...still waiting on front panel.

 

[jimfowler]

...and the schematic

 

[ruffrecords]

The only thing I would say is try to avoid bundling wires from the tube together as this add unnecessary stray capacitance. Take each wire separately to where it needs to go. Tyr to lay out the components to keep the lead lenghs as short as possible.

Cheers

Ian

 

[korneev]

Check the power of the marked resistors, it shall be at least 1 W. On appearance, you have resistors of 0,25 W.

 

[jimfowler]

All resistors are of the correct wattage but thanks for looking out.

Powered it up and all my voltages are within 5% of the desired spec EXCEPT pin 1 of the 12AX7.  I should see 180V and have 140V instead.  As per the spec, these voltages are measured with no input signal and the unit just sitting there idling.  Is this just a matter of adjusting the resistance of the 200K 1W resistor that's feeding pin 1? 

FWIW, Power tranny is Hammond 271X which is spec'd at 560V.

Thanks for the help.  I know that the information you guys have you did not come by idly so I appreciate your willingness to share.

- Jim