Search found 636 matches

by jestaudio
Thu Apr 02, 2020 8:33 am
Forum: Technical Discussion
Topic: PRS Sonzera Buzz
Replies: 4
Views: 439

Re: PRS Sonzera Buzz

No mate, really stressed now but nowt I can do, being in the UK no one wants to even touch these for repair, not even the dealers, its gone on ebay as a spares or repair and cut the loses
by jestaudio
Wed Apr 01, 2020 3:35 pm
Forum: Technical Discussion
Topic: PRS Sonzera Buzz
Replies: 4
Views: 439

Re: PRS Sonzera Buzz

Update, 6v output on transformer is toasted, just expired after tripping the house electrics, one half of the winding is reading 1.5 volts to chassis, the other 6.3 vots, sort of explains why my filament voltages were all over the place
by jestaudio
Wed Apr 01, 2020 2:17 pm
Forum: Technical Discussion
Topic: PRS Sonzera Buzz
Replies: 4
Views: 439

Re: PRS Sonzera Buzz

Ok with a little and very useful advice from Doug from PRSA, big shout out to him for taking the time , I've now narrowed it down to 120hz interference , changed the earthing a little which has alleviated a little of the issue but still left with a noticeable buzz particularly when the reverb is tur...
by jestaudio
Thu Mar 26, 2020 5:01 pm
Forum: Technical Discussion
Topic: PRS Sonzera Buzz
Replies: 4
Views: 439

PRS Sonzera Buzz

Long time no see folks, finally getting back into amps after a long layoff due to work and family, anyone here got any experience with the PRS sonzera 50, my nephew snagged one 2nd hand and it has a annoying buzz on the clean channel, tried the usual and gone for known to be good tubes, PCB are a PI...
by jestaudio
Sun Oct 21, 2018 6:03 pm
Forum: Technical Discussion
Topic: Mesa Mk4 lack of gain, poor sound
Replies: 9
Views: 754

Re: Mesa Mk4 lack of gain, poor sound

Got a friend to pop the old tubes on a test rig, good call from Xtian, one tube absolutely screwed and pulling far more than it should, got it booked in for a quick once over to make sure there's no permanent damage
by jestaudio
Thu Oct 18, 2018 6:18 pm
Forum: Technical Discussion
Topic: Mesa Mk4 lack of gain, poor sound
Replies: 9
Views: 754

Re: Mesa Mk4 lack of gain, poor sound

I don't understand your use of terms as how it relates to amp functions. Gain does not come from output tubes as they have no where near the gain of preamp tubes and will have way more of a effect on the amps volume output and punch. I,m fully aware that overall gain has little to do with the power...
by jestaudio
Thu Oct 18, 2018 6:16 pm
Forum: Technical Discussion
Topic: Mesa Mk4 lack of gain, poor sound
Replies: 9
Views: 754

Re: Mesa Mk4 lack of gain, poor sound

Picked this one up for a reasonable price knowing it needed a full service amongst other things, alarm bell started ringing when the footswitch exhibited some funny behaviour , Leds, not fully illuminating , functions failing to switch, the amp sounded gutless, sterile, real lack of gain on drive c...
by jestaudio
Thu Oct 18, 2018 6:14 pm
Forum: Technical Discussion
Topic: Mesa Mk4 lack of gain, poor sound
Replies: 9
Views: 754

Re: Mesa Mk4 lack of gain, poor sound

Wild guess: Mesa has no bias adjustment in their amps. So if you had badly mismatched power tubes, maybe one or more was drawing too much current, dropping voltages system-wide, and making the LEDs and switching system misbehave. Yeah that makes sense, certainly banging in a matched quad solved all...
by jestaudio
Thu Oct 18, 2018 2:58 pm
Forum: Technical Discussion
Topic: Mesa Mk4 lack of gain, poor sound
Replies: 9
Views: 754

Mesa Mk4 lack of gain, poor sound

Picked this one up for a reasonable price knowing it needed a full service amongst other things, alarm bell started ringing when the footswitch exhibited some funny behaviour , Leds, not fully illuminating , functions failing to switch, the amp sounded gutless, sterile, real lack of gain on drive ch...
by jestaudio
Mon Jul 16, 2018 3:35 pm
Forum: Technical Discussion
Topic: Mesa Mk5 35 switching issues
Replies: 3
Views: 433

Re: Mesa Mk5 35 switching issues

Hi Steve, its all relays mate, I've got it on the bench at the moment,
by jestaudio
Sun Jul 15, 2018 5:18 pm
Forum: Technical Discussion
Topic: Mesa Mk5 35 switching issues
Replies: 3
Views: 433

Re: Mesa Mk5 35 switching issues

Note, I did ask RJM as they have a custom cable that they refuse to ship to the UK, bit pants really, I have a product and they don't want to sell me the correct cable lol
by jestaudio
Sun Jul 15, 2018 5:15 pm
Forum: Technical Discussion
Topic: Mesa Mk5 35 switching issues
Replies: 3
Views: 433

Mesa Mk5 35 switching issues

Bit of a weird one and hopefully someone will have the answer as Mesa are being evasive to say the least, the channel switching , boost etc all work fine using the standard mesa switch supplied, I made a cable up to use my amp gizmo from the spec mesa supplied and get some pretty horrendous relay po...
by jestaudio
Fri May 05, 2017 9:25 pm
Forum: Technical Discussion
Topic: Flatish response valve amp
Replies: 4
Views: 590

Re: Flatish response valve amp

The overall volume is not a issue, simply a case of room in the venues, I may have a play with the Rockster layout, I built one years ago and loved it with pedals
by jestaudio
Fri May 05, 2017 8:32 pm
Forum: Technical Discussion
Topic: Flatish response valve amp
Replies: 4
Views: 590

Flatish response valve amp

Anyone got some ideas or guidance for a scratchbuild single channel valve power amp, I,m thinking around the 20 watt mark, purposed for my small gig rig of (waits for the howls of derision) a floor based modeller, sadly the smaller pubs on the local gig circuit take a dim view of a Orange and Mesa i...
by jestaudio
Mon Jan 09, 2017 10:40 pm
Forum: Garage Talk
Topic: Not a way to sell kit
Replies: 9
Views: 1362

Re: Not a way to sell kit

Was going to pull the trigger on a Fractal AX8 but sheesh what the fuck is the problem with the guys at the Fractal forum, ask a couple of questions and get a round of abuse I'm going Helix, helpful forum and at least you can try before you buy. The latest firmware includes a D style, apparently. A...