This meter is used to check the Cathode Bias of either a Single or Double ended audio amplifier.
Measuring the Cathode Bias may be performed using the built-in analog meter or you may use a
Digital Multi Meter.
Parts:
2 - NTE500A Zener Diode
1 - 1N4001 Diode
2 - SPDT Slide Switch
1 - 1 Ohm 1/2W Resister
1 - 2 Ohm 1/2W Resister
3 - Red Panel Mount Banana Jacks
3 - Black Panel Mount Banana Jacks
1 - 6" W x 3 3/4" L x 2" D Project Box
1 - 50 mA Analog Panel Meter (See below)
1 - 4PDT Rotary Switch (See below)
Hoffman Bias Checker
hoffmanamps.com/MyStore/perlshop.cgi?ACTION=enter&thispage=Misc_BiasCheckerParts.htm&ORDER_ID=!ORDERID!
50 mA Panel Meter
www.ebay.com/itm/PANEL-METER-ANALOG-DC-CURRENT-0-50mA-2-4-X1-9/122168063270?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Panel Mount 4PDT Rotary Switch
www.ebay.com/itm/Panel-Mount-4PDT-Rotary-Switch-Lot-of-3/162025511284?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649