Members ksl Posted November 10, 2021 Members Share Posted November 10, 2021 G'mornin' all~ What you see here is my new old 1973 Davis Model 106 PA amp, that under the hood sits a pair of EL84's, a 6EU7 & a 6CA4 recto,,, and this amp is no firecracker, but more like an friggin' M-80!!,,, 1 Mic. Volume, that middle 'Music' Volume for the audio RCA jacks in the back, & a Tone control, that could use a value change of sorts to let the amp breath a bit better, & brighten things up a tad... BUT when I had the chance to take it for a full out test-ride, besides it's awesome o/d, what at 1st sounded to be just a dirty, noisy volume pot on the guitar, proved to be happening on all 4 guitars I tried (all tone controls were unaffected), and was clearly evident along the almost full sweep of the pot,,, Regardless of the amp's volume, from 0 to 1, and from 9 to 10 on all the guitars, were dead silent,, but along the whole remaining sweep, from 1 to 9, it was real bad,,, again, only on every guitar's Vol pots... Lastly, when I'm plugged into the main MIC input, that middle AUX vol. control seems to add a bit of (pleasing) hair when I turn it up from 8 to 10,,, Only it's own, that AUX volume does nothing... I LOVE this amp, but it's got some strange stuff going only... Thanks in advance for your attention & expertise. Kenny ॐ Quote Link to comment Share on other sites More sharing options...
Members Mr.Grumpy Posted November 13, 2021 Members Share Posted November 13, 2021 On 11/10/2021 at 10:00 AM, ksl said: that could use a value change of sorts to let the amp breath a bit better, & brighten things up a tad... The tone control is a simple treble-cut type, similar to what's used on guitars. You could change the tone capacitor out for one with a smaller value to increase the treble, I'd try one that's half the existing value and tweak from there. Mind the working voltage too, make sure your replacement cap is sufficiently rated for it. On 11/10/2021 at 10:00 AM, ksl said: what at 1st sounded to be just a dirty, noisy volume pot on the guitar, proved to be happening on all 4 guitars I tried (all tone controls were unaffected), and was clearly evident along the almost full sweep of the pot,,, Regardless of the amp's volume, from 0 to 1, and from 9 to 10 on all the guitars, were dead silent,, but along the whole remaining sweep, from 1 to 9, it was real bad,,, again, only on every guitar's Vol pots... Sounds like some DC current is leaking out of the inputs and causing the crackle when you turn your knobs. It's probably too low to worry about. On 11/10/2021 at 10:00 AM, ksl said: Lastly, when I'm plugged into the main MIC input, that middle AUX vol. control seems to add a bit of (pleasing) hair when I turn it up from 8 to 10,,, Only it's own, that AUX volume does nothing... This is a quirk of this amps simple resistor mixer. Turning down the aux control puts a resistive load to ground. There are series isolating resistors, but still you go from a 1.33 Meg parallel load to a 330K Ohm parallel load when you turn the "aux" control down all the way. Just leave it turned up. Quote Link to comment Share on other sites More sharing options...
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