"excellent elimination fella.
a small choke around 50mA/4H would be fine. lots of 50's single ended 6v6 powered radios used a choke input PS, so any out of those would be fine.
the fact that the hum doesn't change with speaker swap…"
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eric gittins
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eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11eric gittins replied to Damon's discussion Dangers in fiddling about with amp guts. in the group It Goes To 11"what kind of amp? we talking transistor or valve?"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"is the hum 50hz or 100hz? 50 is filament, 100 is from rectified B+ supply.
i imagine that your 15" speaker would happily go down to 50Hz, a smaller 6" may not. does the hum go away with as smaller speaker?
input jack isolated…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"yes, still run the the two 100 ohm resistors from either side of the 6.3v winding, and run a wire from where they join together to pin 8 of the 6v6.
some early amp designs ran one leg of the filament supply to the chassis, and then had to run just…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"wow, all change.
your signal ground shouldn't earth to the chassis at the input jack end, only at the other end after the 8uf cap node of the 6v6 screen.
run the input jack earth straight to the earth bus, not via the volume pot…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"the blackface viboverb is famous as the stevie ray vaughn amp. it came first with 2 x 10" speakers, then a single 15". SRV's were seriously modded, and there's heaps of stuff on the net about them.
not really a simple amp…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"that amp looks really good fella, well done.
hum
your earth bus may well be giving you problems with noise.
for my earth bus order i pretty much follow the signal from input to power supply. take a look at the schematic (not the layout), and earth…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"one leg to earth is how its generally done. might not matter in your amp as it doesn't have a feedback loop, but shouldn't be causing a problem.
did you double check that all earths are earthed? clip the neg lead of your voltmeter to one…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"hey, that's great news fella.
the resistor from input to earth, shared between jacks (1M) that usually go on a fender dual input is not required in this design. the grid leak bias design (for the pentode input) needs that 5M resistor and…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"there should be no DC voltage on the speaker side of the OT at all.
the power supply wiring you've used is just like the original. i think whoever drew the second layout you have must have read the schematic wrong to start with. the only…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"hey fella,
at a quick glance, most of your voltages look OK, and the little lower than fender shouldn't be a problem.
the 30v on the speaker isn't right though. i'm assuming all voltages are DC?
and it looks like you only…"
eric gittins replied to Thomas Petry's discussion Hooking up a reverb tank? in the group CBG wiring & electronics."my experience is with valve reverbs so take this with a grain of salt, but,
the input transducer in the tank is basically a speaker without the cone - could you not use the whole 9v amp to drive it? connect the input of the tank where the speaker…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"post that little fender schematic with the voltages you are getting on your build. measure at each valve connection including the rectifier, at the pos. terminals of the filter caps, and the AC voltages off the tranny, both heater and…"
eric gittins replied to Jon Leslie/Runaway Veal Music's discussion Momentary kill switch and single piezo/jack"the resistor goes across the terminals of the switch. no wire across the switch, that would just be like activating the switch.
the resistor across the switch should be of a high enough value that the current would normally rather go…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"that bell sound amp look completely awesome! what a find - is that 2 6v6 push-pull? it looks like it's practically a 5C3 tweed deluxe in a head unit.
it's been a while and no updates - didn't give yourself a nasty shock? blow…"
eric gittins replied to GARAGE HERMIT's discussion trying to hack an old valve radio, into a guitar amp, in the group It Goes To 11"i reckon it will all look a lot more simple when it goes in the chassis and you lose the miles of pink wire.
already thinking of the next amp before this ones powered up - sounds like you're hooked!
don't know about the UK, but over here…"
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Adelaide Guitar Fest
Posted on August 7, 2012 at 1:06am 1 Comment 1 Like
Hey folks, coming up fast on the adelaide international guitar festival now.
got asked to do a stint in the 'meet the makers' slot, so on friday (aug 10th) i'm there, with jimbo to wrestle the crowds, and steer the rowdy ones back to the bar - or give them a guitar.
gonna talk about pickups and pickup making, the joy to…
Continue UNCLE ROB'S PICKUPS
Posted on December 7, 2011 at 7:10pm 5 Comments 0 Likes
hey, my first blog post, and i actually have something to say.
my dedicated CBG pickup website is up!
i have a few different models on offer, all of which i am very happy with, and all of which i use myself.
there's schematics and mounting details and spec's and a bit of general silliness.
all my electro-magnetic pickups (i don't do piezos), are designed and hand wound by me in Adelaide, Australia.
check it out if you can...…
ContinueComment Wall (2 comments)
- At 2:01am on May 19, 2011,
Peter Greed said… Hey Fella,
Congratulations on your new Uncle Rob's Pickups website, it looks great. Having seen and heard your work I’m sure the qualities excellent. I know you are not the sort to blow your own trumpet and definitely not one for the hard sell but really think there will be others on the nation interested in your work.
Cheers
Pete
Disclaimer: While Eric is a good friend and drinking buddy I am in no way connected to his commercial work.
- At 2:57am on March 10, 2011,
Michael Wayne Bragg said… - Wow that is a cool looking amp, How does it sound? Mike.
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