cobra 29LTD chrome need help with receive

[dss56]

Another 29 bites the dust.

Customer brought in a Cobra 29LTD Chrome.
Radio does transmit and receive.
The receive is very noisy lots of static when people are talking.
When channel is silent from talking there are pulses of static in the audio.
Also the rf gain does not fully work
it will work a tad but when turned totally off the radio is still making static noise in receive.
I put a regular 29LTD classic beside it and receive is nice and steady and rf gain will turn receive
almost off to silent.
The radios are basically the same but there is a difference.
That is why I'm looking for a chrome 29LTD schamatic.

Any suggestions on the static riding in on the receive very erratic like a loose antenna connection.
I checked the board for cold solder joints. All look good.
Mic is ok /output ok/audio ok/ radio has builtin Talk back thats ok/

[1968neil]

FET1 2SK1924AY in the first mixer can cause very odd receive faults and the RF gain control will work very oddly
also if you replace FET1 i would replace FET 2 (same type as FET1) at the same time.
Schematic can be found here : http://www.cbtricks.com/radios/cobra/29 ... hr_sch.pdf

Regards
Neil

[ch25]

Sounds like faulty 455(450)KHz filter.
Chris