These pages will contain selected
information on modifications for military, commercial and kit
transmitters and receivers. If anyone has anything they would like to
post here, please let me know.
HW-100/101 and SB-100/101/101W/102.
- SBM-102-1. This is the
modification to all the above transceivers to eliminate the
"Miller Effect". This is what causes the driver and preselector
tuning to appear at different places in the control's range. There
are 9 PDF files here: the first one is the entire mod in one PDF.
The other 8 are each page separately. 1)
- A collection of
Service Bulletins for the HW-100/101.
- Another collection of
Service Bulletins for the SB/HW series
the HW-101. The data
contained here applies equally well to the
collection of HW-101 tips,
compiled by a service tech from Heathkit.
Filter modification information.
to modify Heathkit SB/HW crystal filters for any
This PDF report is especially useful for those who want an AM
filter for any of their Heathkit SB series receivers.
Rectifier tube modification.
completely reversible modification replaces
the very difficult to find 26Z5W tubes with the much easier to
find and cheaper 12BW4s, which also provide a higher dissipation
rating and radiate less heat than the 26Z5Ws.
Modification to Heathkit IP-27.
- Here is a modification for the Heathkit IP-27 power supply to prevent the output pass-transistors from shorting due to a spike caused by too rapid rotation of the voltage range switch.