Upgrading Marantz 7C capacitors

Alfcat you must replace C1,2,3,7,8,11 0,22 uF for 0,33 or 0,47 uf and C14,15 2,2 uF for 4,7 uF or 10 uF. Use brands you used for the MHZS mod or if this is to expensive i like to use Clarity Caps SA serie.

http://www.capsandcoils.com/shop ... x&cPath=1_5



Put parallel to C14 and 15 a small Capacitor 10nf to perfect the hightones.

What type/brand of tubes you use?. This is also a issue, tuberolling can improve the sound.

Alfcat here you can order the Clarity Caps,

http://www.capsandcoils.com/shop ... b6f50bb924c136d494d

These caps are not expensive.

You can use one EH 5751 goldpin tube,i like this tube because of his solid bass.
The 5751 has lower gain as the 12ax7( about 20% ), mostly this is not a problem. You get a better range of your volumepotmeter to.

Alfcat, this problem i had also. I just send a email with the parts i needed and ask for the amount i must pay to them inclusive the shipmentcost and paymentconditions. If you still have problems contact me. I can phone them and place your order.

Dear alfcat, looking at the schematic of the amp. I like to tell you some things.

Not every change or mod give a better sound sometimes it is better to leave it.

Before you got modding set a goal of the things you like to improve.

In your case with the amp for example:

1 - change overall sound: just change C4 and C5 for other types like PIO or change tubes.

2 - If there is humm: replace R1 for a big inductor like 10 or 50 Henry

3 - Got more or less bass control: Change R13 for another value ( between 4K7 and 100K )or replace it for a variable resistor of 100K with in serie a 4k7 resistor. Now you can change feedback ( bass controll ).

Changing resistors with ones of the same value is only use full in low signal voltage amplifiers like phone stages or I/V conversion of DAC's. In power amps this is a waste of money.

Reading about mods is one but listening is the real thing.