This change alone was responsible for a huge increase in resolution in the mid and high frequencies. This was all bypassed, and instead CAT5 teflon twisted pair (one wire grounded at one end for shield) was used to go direct from the op-amp output, through 100-ohm resistor, to the fixed RCA jacks. In the KT-7500 (described below), the audio signal went through two switches, a relay, long board traces, around the power transformer, and then to the RCA jacks. Bypass muting relays, switches, board traces, old internal wiring, etc. Audio section signal routing - Bypass the external de-emphasis switches on the back panel. AC power noise filters will also help, either internal or external.ģ. Dedicated regulators for audio/mpx sections if you are really going all out. New "low noise" diodes, with snubber circuits, bigger better electrolytic caps with smaller bypass caps. Measure AC on chassis to outlet gnd with plug oriented both ways, mark plug for lowest noise. Power supply - Raise the transformer off the chassis with rubber grommets.
#BI POLAR CAPS IN SIGNAL PATH CRACK#
When reinstalling the screws, don't re-tighten them so much as to crack the circuit board - just good and firm.Ģ. Second, clean the interface with Caig DeoxIT or another commercial electrical contact cleaner. First, remove the screws and inspect the board and frame for corrosion or dirt. Loose screws can cause electrical problems in the KT-7500 and other tuners. There are four screws that clamp the circuit board to the steel frame, which holds the power transformer and more. Return ground path - On the Kenwood KT-7500, there is a way to help ensure the integrity of the return ground path. General DIY Tips | More General Tips | Denon TU-800 | Harman/Kardon Citation 18 | Kenwood 600T | Kenwood KT-615 | Kenwood KT-815 | Kenwood KT-880D | Kenwood KT-917 | Kenwood KT-1100SD | Kenwood KT-3050 | Kenwood KT-5020 | Kenwood KT-5500 | Kenwood KT-6500 | Kenwood KT-7300 | Kenwood KT-7500/7550 | Kenwood KT-8300 | Marantz ST6000 | Mitsubishi DA-F20 | Philips AH673 | Pioneer F-90 | Realistic TM-1001 | Sansui T-60 | Sansui T-80 | Sansui TU-217/317/417 | Sansui TU-517/717 | Sansui TU-719 | Sansui TU-919 | Sansui TU-9900 | Sansui TU-D-99X | Sansui TU-X701 | Sony ST-4950 | Sony ST-A6B | Yamaha T-85ġ. We started with Kenwoods and branched out from there!
Granted to quote our text so long as proper credit is given.ĮBay listings that quote us incorrectly or without credit may beįor those interested in modifying tuner audio sections, this page offers a few general suggestions, followed by specific information relating to many popular vintage tuners. I can understand earlier it was tough to get high value ceramic capacitors.Now that too being easily available (of course at a trade-off of cost)should it be a problem ?Īlso the various attributes of non polarized ceramic capacitors like temperature stability should give it an upper hand. He has replaced all the electrolytic in the signal path of his audio equipment with non polarized caps. I have a friend who's into music in a big way. Another difficulty is that the actual value of capacitance may be neither very accurate or very stable.Polarized capacitors are usually electrolytic, I.e., part of the capacitance has to do with chemistry, which is slow, so they can introduce phase errors" They usually require a dc polarizing voltage to stabilize the oxide layer, and being a chemical process, either very high or very low temperatures can be a problem. You'll ruin a polarized cap by passing AC through it".Polarized capacitors use a very thin oxide layer as the insulating medium between the plates, so that the capacitance per unit volume can be made very high.
Unfortunately everythng i found just doesnt go by this advice.Please see my findings below: Not convinced with this I started searching for reasons. I been adviced to use polarized capacitors for AC coupling of Audio signals.
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