The correct stylus pressure for the RCA cartridge is 2.75 ounces, so the pressure wasn't too much over, but I still wanted to get it closer to the recommended pressure. The next step was to figure out a way to adjust the tone arm pressure.
I mounted a tone arm rest I found from an old Collaro record player, then I installed the motor and on/off switch. I mounted the tone arm perch and routed the wires down below and soldered them to an RCA phono jack I installed under the motor board. When my cartridge came back from West-Tech Services, I installed it in the tone arm and replaced the original metal shielded cable with much lighter 30 ga. I sanded the veneer and applied two coats of Minwax Golden Oak stain and finish. I covered the Masonite motor board with PSA veneer. I put new felt on the platter, and cleaned up the nice brass on/off toggle switch. The motor seems to run well, and I checked the speed with a strobe, and it is extremely accurate. I also serviced the motor and installed new rubber motor grommets. The tracking arc is the same as the original.
I used the original motor board as a template for the motor and tone arm cut-outs. The John Vassos tone arm is the same effective length from pivot to needle tip as the tone arm shown in the first image, so I mounted it in the same location on the motor board. I made a new motor board from 1/2" Masonite and made cutouts for the motor mount, tone arm, and an on/off switch. In the meantime I found a nice Pro-Linear AT-1600 turntable base at a very reasonable price on EBay. I sent the cartridge off to West-Tech Services for a rebuild. I was lucky to find a John Vassos designed RCA tone arm like the ones used in the RCA Victor Special Models, with a cartridge. I'm not sure of date or model, but the RCA tone arm has been around snce before WWII. I started with a turntable that appeared to be a pull from a RCA consoleI. Sometimes customers just send the amplifier, which is a battery operated three tube amp, using a 1G6 output tube, and it needs the higher voltage of the old crystal cartridges to properly test the amp.
I wanted to build a test platform using the same tone arm and cartridge as the RCA Special Models. I built the 78rpm turntable described in this article for testing amplifiers used in the RCA Victor Special Models that I occasionally restore for people. RCA 78 RPM Home Built Turntable with a John Vassos Tone Arm It's not the Destination, It's the Journey.Vintage RCA Victor Record Players Vintage RCA Victor Record Players I buy a lot from Mouser, but I usually have much to buy and the parts search isn't for the faint of heart. A few times non-polarized electrolytics are used in places like speaker crossover circuits. Polarity is very important with electrolytic caps. Printed circuit boards used in most solid state units use radial ( the two leads coming out the same end) as well as axial (a lead exiting from each end). You will have to check and see if you need a radial or axial lead arrangements.
The capacitance rating is frequently higher. You probably will be looking for capacitors with lower voltage ratings than typical tube electronics since your unit is solid state. Some sources are more expensive than others.
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