Hammond PWDF13061 Collins KWS-1 T-502 866A HV Filament Transformer

PWDF13061 is a high-voltage filament replacement transformer for the Collins KWS-1, listed as the 866A filament transformer in position T-502. It is part of Hammond's PWDAHL Series, the Peter W. Dahl catalogue of magnetics for amateur radio products, and is aimed at KWS-1 owners and restoration technicians.

The single secondary delivers 2.5 VCT @ 10A CCS and is specified with a 10 KVDC test. The primary is 115/230 VAC, 50/60 Hz, single phase, so it is listed for both 50 Hz and 60 Hz supplies.

The ordering table describes this unit as bobbin wound with epoxy filled bays. It is built on an EI-087 x 1 core and listed as Style 7 on the series style sheet. The approximate weight is 2 lbs, and the shipping weight is 2 lbs (0.91 kg). PWDF13061 is REACH compliant and RoHS compliant.

PWDAHL Series transformers are usually built to order one at a time, and Hammond advises confirming availability by phone or e-mail. Identifiers are UPC 623980930633 and UNSPSC 39121301.

The 10 KVDC test rating on the secondary, together with the bobbin wound construction and epoxy filled bays, is what distinguishes this high-voltage filament unit from an ordinary filament transformer of similar current.