.1uF coupling caps in 5E7M

Hi!
I have a 5E7M build that is almost ready to be finished, I just have to order the last few parts before I can solder it all together. Most all components are mounted on the board though not yet soldered. But after having had the project lying on my shelves for a few months now while concentrating on other amp builds I have begun to think that maybe I should up the .022 uF coupling cap in one of the channels to something like .047 uF or even .1 uF to gain a little more bass in that channel's tone.

I like the character of the 5E3 very much, and though I am aware that they are completely different animals circuit wise I am sure that the .1 uF caps in the 5E3 is at least part of its wonderful tone. I generally tend to like bassier sounds rather than the treblier ones.

Is there anyone who has tried to put higher value caps in a 5E7/5E7M or any other amp for that matter? How did it work out?

For your information, my 5E7M has an MM Bassman OT, which will stiffen the amp up some compared to the standard spec and relatively smaller size 5E7 OT. The PT is an MM Bassman PT with 320-0-320 V HT's. I will make the amp switchable between fixed and cathode bias and I will use it for both harp and guitar.

Thanks all for any comments on upping the coupling caps!

4 S.

I have been using .1 caps in my 5F1 builds and other amps as well. I play harp and like the bassier tones I get from the .1s

.022s give a full-range sound without the mud.

If you don't mind a little extra "fart" when the amp is cranked, go for it.

You can figure out the low-end corner frequency by 1 / (2*Pi*R*C), where R is the grid resistance on the next stage, and C is the coupling capacitor in farads. FI, between the first and second stages on the 5E7, there's a 0.02uF coupling cap and 1 Meg resistor (the volume control), so:

1/(6.28*1000000*0.00000002) = 8 Hz. So unless your guitar has notes that low, you're not going to gain much by changing the values. But, hey, it's a free country. :lol:

- Scott

Scott and TNO are most likely right about a .1 being a bit muddy for guitar, however for harp it is just right. You can always do what I did on one of my amps, put a "Bright" switch in. Install a .022 and a .1 on a switch and have it both ways.

Thanks all for your replies!