Re: Filter cap's effect on tone ???



Newbie Doobie wrote:

ok... thanks all I'll consider replacing the caps.

I am concerned about noise (hum) and am attempting to make all the
right moves to minimize it. I have just been through tweaking my other
amp with all new filter caps (only slightly higher values than
origional), re routing leads (inc. better zoning of grounds), installed
2 100k Rs in the "make do" heater CT and floated the circuit at +35v,
shielding on preamp signal wires, isolating input jack (did the stereo
jack trick), isolated the speaker (bypassed the jack), replaced B+
carbon comps with flameproofs, replaced any coupling or tone caps that
hummed when I waved my finger near, installed mostly all new and
matched tubes, replaced all cathode bypass caps, re-built the PI (and
subbed in a choke as a tail), installed individual bias pots, cleaned
all pots and tube sockets, re-soldered any suspicious contacts,
Installed a 500 ohm 25 w R after the ss rectifier (before the choke),
and to further address the noise issue drew a deep breath and yelled
"GET OUT!" !!!
This amp now sounds better than it ever did but the hum is still
apparent (not bad but still there... ya know) and even though I
thoroughly shielded and star grounded the guitar and use a 2 conductor
guitar cable with full foil shield grounded at one end only....I still
get a reaction in the eletrical sounding buzz when I touch the guitar's
metal parts or touch the amp chassis (the buzz goes away)....WHAT UP !
When I record, am I gonna have ta stick a wire down in my my boot to
quell the buzz ?
(yes I'll risk death to eliminate the noise !) sheesh....

Short of going DC on the heaters (some report difficulties in
regulating and getting all voltages right),

Would it be a benifit to add more B+ filtration ?


STOP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Throw yourself into EMERGENCY *STOP*!!!!!!!!!!!!!!!!!!!!!

Damn,...... you're giving me a headache.

Now, take a deep breath, and throw that soldering iron out the window, and be sure to unplug it
first.

Have 2 beers, a pizza, and relax.

Then, after you've done that, come back and read the rest of my comment.

I'll stop back in here later, and see ya in about a half an hour.



Regards,

Rich Koerner,
Time Electronics.
http://www.timeelect.com

Specialists in Live Sound FOH Engineering,
Music & Studio Production,
Vintage Instruments, and Tube Amplifiers
.

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