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PRF members' tech journal

All your geeky questions about electronics, microphones, tape machines, etc.

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PRF members' tech journal

Postby Lonesome Bulldog on Thu Jun 11, 2009 1:09 pm

Little details from your workshop, etc. The humble and/or complex things we do in our free time, or for those clever folks, at our jobs.

Yesterday I revamped my Avatar 4x10 with a blown speaker. Took the dead one out, took the 3rd good one out. Put the good 3rd into a 1x10 cab that came from a combo with a bad head. Cut the 4x10 cab in half. Used the scrap to close it up, and to make a panel for the 1x10 where the head used to be.

Now I have a 1000W 2x10 and a 500W 1x10. Contemplating uses for the SWR 10" I took out of the little cab. Might throw it in my 4x10 Peavey Classic 50, to give it a little boomboom. One of those speakers has a patched cone anyway. AFAIK it's ok to mix-n-match.

Starting to use my multimeter more frequently. This can only be a good thing.

Also, partially mounted a pickup on my Panjo.
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Re: PRF members' tech journal

Postby Trad on Thu Jun 11, 2009 1:17 pm

Bulldog Mangan.
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Re: PRF members' tech journal

Postby japmn on Thu Jun 11, 2009 1:41 pm

List of shit that really needs to get done:

Install new tuning heads (that have been sitting on my desk for 3 months) on 70's Kawai hollow body. Also figure out how to mount pickup on it.

Strip and refinish Jap Jazzmaster. Buy and install Mastery Bridge. Have 19th fret replaced.

Purchase new Preamp tubes for fender Quad Reverb. Buy plywood and grill cloth and repair damage done by cat. Pull the Fender Utah Speakers out and replace with 12" that are suitable for bass guitar.

Buy new Tuners for 70's Jap Jazzbass knockoff and adjust the neck.

Buy and Build BYOC Super Fuzz clone to replace Univox Super Fuzz that is getting unreliable for live use.

Build cabinet for rotating speaker I pulled from an old organ found in the street.

Finish modding 3 Shure M67 Mic Pres for individual outs.

Why is Ch 1 of Sytek not passing Phantom Power? Find out.

Buy and install better transformer for Chinese tube mic.

Mod Roberts reel to reel preamps for balanced mic in and line output.

Do something with the Rogers drum shells in my basement.

Build 3 pedal boards (Bass, guitar, keys) with power supplies and cabling.

Put new tape on my bike handlebars.
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Re: PRF members' tech journal

Postby Trad on Thu Jun 11, 2009 1:56 pm

japmn wrote:Mod Roberts reel to reel preamps for balanced mic in and line output.


Mine was modded in this way with Jensen transformers in and out. It's also still usable as a very low output guitar amp. It's a fun box.
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Re: PRF members' tech journal

Postby eliya on Thu Jun 11, 2009 2:17 pm

I need to check what's wrong with my S6000 inner routing - the channels are out of phase with each other, it wasn't like that before.
Also, need to check again that the PSU is still holding steady voltages and not drifting, I'm pretty sure I fixed it back then, just need to re-check and make sure it's fixed.

It's time to overhaul the YBA1. Recapping the PSU and changing the tubes should be my first steps.
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Re: PRF members' tech journal

Postby Rodabod on Thu Jun 11, 2009 2:53 pm

Don't get me started!
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Re: PRF members' tech journal

Postby Lonesome Bulldog on Thu Jun 11, 2009 3:21 pm

Rodabod wrote:Don't get me started!

C'mon!
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Re: PRF members' tech journal

Postby eliya on Thu Jun 11, 2009 3:49 pm

Lonesome Bulldog wrote:
Rodabod wrote:Don't get me started!

C'mon!


Dude, I know the guy and I've been in his room. Don't get him started!








c'mon!
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Re: PRF members' tech journal

Postby benadrian on Thu Jun 11, 2009 3:59 pm

Yesterday. I worked on a few guitar vs. gravity mixes, tracked a couple vocal takes, and hang out with the drummer, who rules... used to play drums for Agent Orange.

Also, I added resistors to the Fuzzy Bunny board that will be going to the$inmusicisallmine.

Then, I tried to debug a broken fuzzy bunny. DC is appearing on a pot that shouldn't have DC. That is also causing the last gain stage to not amplify at all.

Yikes:(

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Re: PRF members' tech journal

Postby Rodabod on Thu Jun 11, 2009 4:17 pm

eliya wrote:Dude, I know the guy and I've been in his room. Don't get him started


Doude, let's keep this clear. You've seen inside my room. Nothing happened. That post was ripe for bad jokes. And yeah, it's a workshop in there. Sadly of the technical sort.
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Re: PRF members' tech journal

Postby eliya on Thu Jun 11, 2009 4:20 pm

Rodabod wrote:
eliya wrote:Dude, I know the guy and I've been in his room. Don't get him started


Doude, let's keep this clear. You've seen inside my room. Nothing happened. That post was ripe for bad jokes. And yeah, it's a workshop in there. Sadly of the technical sort.


:D
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Re: PRF members' tech journal

Postby stel on Thu Jun 11, 2009 5:40 pm

1. rehead all drums and tune
2.redo the wiring in my jap tele
3.rebuild/modify several mic stands to make drum micing easier
4.retube bassman 300 w kt 88s
5.replace patched 10" driver in ampeg cab(I need a 16 ohm 150-200w 10", having trouble finding)
6.wire my patchbay so I can quit cramming my fatass in behind my rack every time I want to reroute something.
7. make newly inherited dano playable
8. quit making lists and just start doing the shit I need to get done.
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Re: PRF members' tech journal

Postby Nate Dort on Thu Jun 11, 2009 6:30 pm

*finish building my home studio. drywall is getting finished this weekend. then it's paint, lighting, flooring, trim, soldering a bunch of XLR wall panels, and acoustic treatments, in that order.
*recap my hammond m-3
*replace bridle straps on my rhodes
*finish modding those group-buy preamps I got a while ago
*build another fuzz pedal
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Re: PRF members' tech journal

Postby garthplinko on Thu Jun 11, 2009 7:53 pm

Things to do:

1.) Fuck the repairs and write some god. damn. songs.

I got my Champ back. All else can wait.
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Re: PRF members' tech journal

Postby benadrian on Sun Jun 14, 2009 1:44 am

Last night I spent about 5 hours drawing out the schematic for my new pedal. I was putting it into some CAD software and drawing out a circuit board. That was an intense evening of concentration.

Today I went into my rehearsal space/workshop. I was going to record and build, but vocals were going so well I didn't get to any electronics.

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Re: PRF members' tech journal

Postby matt_stevens on Sun Jun 14, 2009 9:05 am

Top of my list is to get some PCBs made up for a midi-controlled line mixer I'm building. I need to get this done in the next couple of weeks while I can still use the labs in uni...

Also need to make up a PSU for some preamps I'm building, and finish off the metalwork on an SSL compressor clone.
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Re: PRF members' tech journal

Postby tarandfeathers on Sun Jun 14, 2009 10:35 am

Put a new battery in my new A810, went with a NiMH one and it seems to be running smoothly so far, holding it's data, not freaking out and rebooting in the middle of playback etc. Also cleaned all the old battery crust off the pcb and checked the continuity of all the tracks that had crusty stuff on them.

Checked the azimuth and did a repro calibration for 15 & 30IPS, discovered that the bass repro adjustment doesn't do anything on one of the repro cards (swapped the card into the other channel and the problem moved with it). Looking at the schematic, probably a schmutzed DAC or maybe one output of the decoder is dead. Tried re-seating the chips to no avail, so I will pick up a new one of each tomorrow and see if I can finish doing the line up properly so I can get on with mixing some records!
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Re: PRF members' tech journal

Postby greg on Sun Jun 14, 2009 9:34 pm

You might want to recap the audio boards too.
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Re: PRF members' tech journal

Postby tarandfeathers on Mon Jun 15, 2009 5:11 am

Yeah, I am planning on doing that in the next month or so. Unfortunately I haven't found anywhere in the UK that stocks all the caps I need in one place so I'm waiting until I have enough stuff to justify an order from Digikey...

Edit: Just wondering if you normally replace the solid aluminium caps? I'm guessing it's not necessary since the electrolyte in them can't evapourate?
Last edited by tarandfeathers on Mon Jun 15, 2009 5:49 am, edited 1 time in total.
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Re: PRF members' tech journal

Postby eldupay on Mon Jun 15, 2009 5:17 am

Here's some DIY stuff i've done over the last few years.

Two JLM DI's and two fuzz pedals. (2007)
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1176 from Mnats pcb set.Transformer I/O(2007)
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JLM 1290 Neve Clone (2005)
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