Seeburg V200 HFMA1-L6 Pickering Cartridge Input Resistor

[jeffinmn]

I have a Dr Know It All's Seeburg Reference Book. On page 20 it talks about changing the input resistor R7 on the older amps such as the MRA5-L6 from 47k to 470k or even 1 meg ohm. I did change R7 to 1 meg ohm on my MRA5-L6 and it did provide a nice increase in the treble. I use the Pickering 345-03D cartridge. I'm wondering if there is a resistor in the V200 amp HFMA1-L6 that could be changed to increase treble. 

I studied the schematic for both amps and they are different due to the noise suppression circuit in the HFMA1-L6. I leave it to the minimum (off) position. In the MRA5-L6 the center conductor of the input jack J6, has the resistor R7, in question that goes to ground. The input from J6 continues to pin 1 of the 5879 tube. 

In the HFMA1-L6 amp, input jack center conductor goes through C25, a .02mfd, to pin one on the 5879 tube. Resistor R4, a 220k resistor also goes to pin1 on the 5879 tube and ground on the other side of the resistor. Would increasing the resistance of R4 increase treble? 

[jeffinmn]

I removed R4, the 220k ohm resistor and installed a 1 meg ohm resister. The treble did increase a decent amount which I really like. If you'd like your V200 or VL200 to have more treble I encourage you to make this change. If in the future someone thought there was too much treble it's easy to turn the treble control down. This is in the HFMA1-L6 amp. One side of the resistor is connected to pin 1 of the 5879 tube and the side goes to the ground strip.