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FDP Forum / Fender Amps: Vintage (before 1985) / Silverface Champ volume question

phil lassiter

Tulsa,Oklahoma

Don't blow your top,I'm leaving town.
May 21st, 2016 10:58 AM   Edit   Profile   Print Topic   Search Topic

Is the maximum volume reached between 3-5 on the amplifier and anything further just compresses the signal?

BbendFender
Contributing Member
*********

American Patriot

I'm on guard these days.
May 21st, 2016 11:22 AM   Edit   Profile   Print Topic   Search Topic

Not sure if it supposed to be a Linear or Audio volume pot but I had the same problem with a Princeton Reverb. I don't remember what was in there but I switched it out for a pot that gave me gradual volume and not a sudden full volume.
Your volume pot may just need a good cleaning. If you have an analog meter, you might check it to see how it is working.

keithb7

Canada, Kamloops

Vintage Amp Hoarder
May 23rd, 2016 05:14 PM   Edit   Profile   Print Topic   Search Topic

In my experience yes, max volume is achieved between 3 and 5 in an old Champ. After that it just breaks up more and offers overdrive. Not really losts louder, just dirtier than the max clean signal, and little louder.

catnineblue

LA , Calif

I try my best
Sep 30th, 2016 09:00 PM   Edit   Profile   Print Topic   Search Topic

Two things come to my mind.

#1 if you have the stock speaker they break up to soon and flab out if you want more try a Weber Sig 8S alnico.

#2 most were biased far to hot many if stock had a 470 ohm cathode bias resistor and the 6V6 ran near 18 to 19 watts and that high they just breakup and add the stock speaker it's worse. Some players like it that way you describe.

I've had a 71 and 80 and 73 SF champ and all were on the hot side. On the 73 I changed the cap can and the other two electrolytic caps and the speaker and got the bias down to 14 watts tops and the volume was a steady up from when it starts to sound maybe past 1 then all they way up. Also depends of the guitar PU's .

(This message was last edited by catnineblue at 11:01 PM, Sep 30th, 2016)

tremolo1965

Seattle

Nov 4th, 2016 11:28 PM   Edit   Profile   Print Topic   Search Topic

They vary. I've got a couple ('68 and '72) - both top out around 5-6 in terms of volume (they've been serviced). My favorite sound for light breakup / overdrive is at around 7 on the dial, after that the 8" speaker kind of loses it, even with the bass turned way down. The '68 has a Weber (alnico) which might, or might not, be a tad better than an original speaker (which might have some wear given the age of these things). I imagine if I had the 'ideal' speaker there are some nice 'hidden' sounds 7-10.

(This message was last edited by tremolo1965 at 01:31 AM, Nov 5th, 2016)

catnineblue

LA , Calif

I try my best
Nov 5th, 2016 12:52 PM   Edit   Profile   Print Topic   Search Topic

They have a 1 med audio volume pot treb and bass are 250 K audio. The stock fender special design alnico in the 73 I had was ok at low levels yet turn up the bass and it flubbed out at 3. The weber Sig 8S alnico really made a difference if you get the ceramic version of the Sig8 alnico the ceramic is to stiff and the Sig8 has a smooth cone and breaks up early. The stock fender speaker has a very thin cone paper. I like break up but not so soon and I like bottom end so the Sig 8S alnico worked well for me. Mine always had a steady volume and got louder as I turned it up and at 7 it begins to break up.

Some people like the over biased 6V6 , I didn't they clip in a harsh way even if the tube can take it.

FDP Forum / Fender Amps: Vintage (before 1985) / Silverface Champ volume question




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