Amp tinkerers and people who aren't afraid of 700 volts or so in here....

Moderators: Slowy, Capt. Black

User avatar
BY willow13
#848515
Mike Clayton wrote:
willow13 wrote:94% finished building a new guitar..will post in own thread with some other purchases that I have made over the past 6 months that I haven't mentioned here

Pics or its just a rumour...


no...i'm shit at taking pic as I build stuff so normally it is just a photo of the wood then the finished guitar :rofl: ..don't even think I took a photo of this wood. Maybe Nic (zaulkin) did? NNNNIIICCC
User avatar
BY Bg
#848740
Closer to amps than anything else.... I tried to decide to do with off cuts. And ended up with making stuff from my more exotic offcuts, like cherry and rimu. Chrome tube offcut, not entirely sure where that came from, just hanging out in the workshop - just in case it came in handy for something.

Pics to follow.
User avatar
BY Bg
#848744
So... perspective looks a bit weird, I'll take some better pics of the new one I'm going to do tomorrow :D Need one for work too ;) And I have many ideas...

I figured having the best part of 7 hand shandies worth of headphones lying around on desk near water/wine or on floor was an accident waiting to happen!
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User avatar
BY Bg
#849950
Ok, this weekend I will be mostly finishing an EV Theile cabinet as the majority of bits landed on my desk today - tolex, grille cloth, sound deadening stuff, corners and feet :D

Then starting on a Trinity cab head build.... Most of the bits should arrive tomorrow, some bits early next week.

Then my order book is free, don't be scared to ask for a quote, I'm seldom nasty :D
User avatar
BY Bg
#849951
Oh and if I get a few mins, I'll finish off a guitar neck headphone stand, which will be for sale. Made from an allparts neck that never ever behaved itself, had to tweak the truss rod every week without fail. What a pile of shit that one was. I've had way better no brand chinese necks....
User avatar
BY Bg
#849952
be aware, I've taken out the truss rod, so your headphone stand could end up like a banana..... ;) its only the first 7 frets worth, it should be ok :eek:
User avatar
BY Bg
#850129
So the Theile is finished, all bar the wiring and front grille :) Lovely day today in the outside workshop, always a pleasure to build stuff in the sun! Photos to follow tomorrow!

Started cutting wood for the trinity cab, haven't got back onto the headphone stand yet!
User avatar
BY Bg
#850130
I am however a bit pissed with myself for doing 3 mitre10 runs when if I'd sat down properly and made a list at the start, one would have sufficed.
Still lovely sunny day, spider with the top down and weezer on the stereo. Cruising.
User avatar
BY Mike Clayton
#850134
Met a guy yesterday who had a pile of vintage Fender blackface amps. Then saw a video of him doing SRV's "Cold Shot" with his band. Jeez, what a cover... great vocal (same guy Dave singing) & nailed the guitar tone thru a Vibroverb & a Vibratone clone (guitar leslie). Far canal! My next project is a Vibroverb. Get swatting on the Vibroverb 1x15 combo cab BG!
Last edited by Mike Clayton on Sat Jan 18, 2020 5:50 pm, edited 1 time in total.
User avatar
BY Cdog
#850135
Amp tech question.

AB763 fixed Bias circuit, build is complete all Voltages look normal for 2x 5881s. During final tests quite by chance noticed an intermittent Bias runaway from idle at ~28mA to a over 200mA. Bias Voltage plummeted and B+ sagged from 430VDC to a little over 220VDC. Was able to kill the power and inspect right away, thankfully. No issues observed. On re-energising it problem had disappeared... but about 5 minutes later it happens again.

First thought is replace the bias electrolytic capacitor, which I've ordered.
Could it be faulty Power Tubes? Any other ideas?

Image
User avatar
BY Mike Clayton
#850138
You could firstly run it with no power valves installed & confirm no issues. Then if you've got some known good 6L6's/5881's try it with them. PS nice looking build! Also, are you running it with a dim bulb tester - might save you some major component damage whilst fault finding.
User avatar
BY Bg
#850139
Mike Clayton wrote:Met a guy yesterday who had a pile of vintage Fender blackface amps. Then saw a video of him doing SRV's "Cold Shot" with his band. Jeez, what a cover... great vocal (same guy Dave singing) & nailed the guitar tone thru a Vibroverb & a Vibratone clone (guitar leslie). Far canal! My next project is a Vibroverb. Get swatting on the Vibroverb 1x15 combo cab BG!


Oh that sounds good :) another classic cab ticked off the list!
User avatar
BY Cdog
#850147
Mike Clayton wrote:You could firstly run it with no power valves installed & confirm no issues. Then if you've got some known good 6L6's/5881's try it with them. PS nice looking build! Also, are you running it with a dim bulb tester - might save you some major component damage whilst fault finding.

Cheers Mike. I have some old 5881s kicking around somewhere, good idea. :)
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