Dave wrote:
I have just re-capped the power supply capacitors in a DX-40 with 40uf
450 VDC Aluminum Electrolytics from NTE Electronics in New Jersey.

I have noticeable hum on the carrier. Measuring the ripple voltage with
a 10 Megohm ac coupled meter shows 2.3+ volts [average/rms ...
non-sinusoidal] on the 600 vdc line and 1.2 volts [average/rms ...
non-sinusoidal] on the 300 vdc line.

It appears the RS of the capacitors is way too high.

What manufacturer or brand are others using with success? Does MOUSER
carry suitable replacements? If so, what brand/style?

Other sources?

TIA

DD, W1MCE


Dave, Although I concur with the thoughts of others replying, FYI, I use
the Xicom series of electrolytics from Mouser with success on virtually
all projects that have been recapped, transmitters and receivers.

thanks

K3HVG wrote:

Dave wrote:

I have just re-capped the power supply capacitors in a DX-40 with 40uf
450 VDC Aluminum Electrolytics from NTE Electronics in New Jersey.

I have noticeable hum on the carrier. Measuring the ripple voltage
with a 10 Megohm ac coupled meter shows 2.3+ volts [average/rms ...
non-sinusoidal] on the 600 vdc line and 1.2 volts [average/rms ...
non-sinusoidal] on the 300 vdc line.

It appears the RS of the capacitors is way too high.

What manufacturer or brand are others using with success? Does MOUSER
carry suitable replacements? If so, what brand/style?

Other sources?

TIA

DD, W1MCE


Dave, Although I concur with the thoughts of others replying, FYI, I use
the Xicom series of electrolytics from Mouser with success on virtually
all projects that have been recapped, transmitters and receivers.