Hello all. First post here. I recently started working on an old TS-430 since I got my General ticket. Being an old rig, the problems seem to be legion. No, I don't want to replace the rig. The first thing I've noticed is poor audio quality on AM receive. From what I've read, this is due to using the SSB filter on AM; this radio doesn't have the AM filter installed. I ordered the optional AM and narrow SSB filters and will install them when they arrive. I assumed that I would need to clean the filter relays since the radio hasn't been used in quite a while so I did the 25 ohm resistor "cleaning" procedure by feeding current through the antenna connector for two minutes wile stepping through each band 1Mhz at a time. It seems that the radio receives well through the entire frequency range. The next thing I noticed, however, was no receive at all in SSB mode. I traced this down to an intermittent contact in the Wide/Narrow switch. After switching back-and-forth between wide and narrow, SSB started receiving. I suspect this switch shouldn't do anything, though, since there is no narrow filter installed. It does look like that filter was installed at one time in the past - and subsequently removed presumably for sale. This is where my first question comes: How do I clean this switches and, if not possible, where might I find a replacement? I found a couple "switch units" on eBay but they're in Bulgaria. The next problem was on transmit - horribly distorted SSB transmit. Investigation on the Web pointed me to intermittent solder joints in the PA which I have since re-soldered. I also added the "z wire mod" to prevent the bad solder joints from causing damage in the future. Re-soldering the PA solved the SSB transmit distortion, but now AM transmit audio is horribly distorted. Unfortunately I'm not sure where to look next; output power is not fluctuating and SSB audio is clear as a bell - supposedly the two signs of bad solder joints in the PA. I can't seem to find anything on the web about distorted AM transmit audio - but it seems strange that this problem only appeared after working on the PA. Would I be correct to suspect that the bias on the PA transistors may need to be re-calibrated? If so, where can I find the procedure? I have also read about oscillating 5v and 8v rails when powered with >12v (my power supply is set at 13.8vdc) - the fix being additional capacitance filtering on the voltage supplies - but am not sure if this could cause AM transmit distortion. I suppose to test this theory I could simply turn the power supply voltage down to below 12v. Unfortunately I'm not sure which pin of IC9 is the "input." Another problem I've noticed has to do with the built-in meter and the RF-gain knob. RF-gain control seems to be operable, though it seems to have quite a small range; less than a quarter-turn of the knob mutes all incoming signals - even the strongest signals (such as a 10w mobile transmitter less than 250 feet away) are muted. Also, as the RF Gain is turned counterclockwise, the signal meter continually moves to the right until the meter is pegged. This seems counter to the effect of a reduced RF input. The ATT switch seems to function correctly, though. Also the meter never moves when transmitting on AM or on SSB. The radio is putting out a solid 100w carrier in AM mode (verified with an external meter) and swings to more than 100w in SSB. Even under these conditions, the meter never moves regardless of the position of the ALC/IC switch. I suppose this could be caused by a bad switch as is the case with the Wide/Narrow switch so this is another case where I need to figure out how to clean the internal contacts. Further, when transmitting in SSB mode with the speech processor activated, the radio transmits power even with the MIC at zero gain. I haven't listened to a receiver when transmitting in this condition, though, so I'm not sure what kind of audio the radio is producing. On another probably unrelated note, I've also noticed that the radio has been modified to allow general receive from 0-30 Mhz. When listening to signals in the extreme low end of the band, I've noticed "dead AM carriers" at 200, 299, 399, 499, and 599 kHz. These signals disappear as soon as I remove the Coax cable so I'm fairly certain they're not internal oscillations. I suppose these signals could be the cause of the general HF hash I've been picking up around my QTH. So, to recap the questions: How do I repair/clean the switches on the front of the radio? Where do I place the 0.1 uF capacitor to smooth the 5v regulator? Where should I look to find the cause of distortion on AM? Is the meter on the front of the radio operating as expected? Should the radio transmit power with no Mic input on SSB with the speech processor enabled? Many thanks!