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Topics - doombass

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Bass Amps & Effects / Tube Amp Doctor Plexi 150W Kit.
« on: October 21, 2017, 03:58:29 PM »
About six months ago I decided it was time to dig deeper into tube amps technology. It all started a few years ago when I decided it was time to learn how to replace tubes. Since I'm an industrial electrician I thought I'd at least be able to do that myself. Next step was troubleshooting my Orange AD200B MK2 which had an intermittent crackling distortion problem (turned out it was something completely else, another story).

Finally I wanted to put together a nice amp kit. I have the Orange and a Hiwatt DR201 and love their concepts along with memories of gigging with an old Marshall Superbass which actually was my turnover point towards ditching solid state amps in favor of tube amps so I fell for the TAD 150W Plexi kit.

The preamp is based on the old Marshall Superbass with some components tweeked further towards bass use, along with using ECC81-tubes as second stage and phase inverter instead of ECC83's all the way. The power supply and power stage is based on the same type as the aforementioned British amps which use what some call dual rail supply for the plates and screens and 6550/KT88 powertubes. This kit comes with KT88's when ordering a complete amp.

The documentation included schematics and wiring layout. The wiring layout only showed from between which points the wiring should go, not where the wires would be run inside the chassis to avoid any crossover feedbacks/interference. I found that to be the biggest challenge.

First step was mounting tube sockets, transformers and capacitors:

Heater and B+ wiring:

Power supply:

Turret board:

Connect turretboard with the rest of amp:

Measuring voltages. Install tubes:


Ok. So what did this beginner manage to screw up? First of all, Tube Amp Doctor provided all the material except double adhesive  tape used to keep the rear plexi panel in place where there are no components keeping it tight to the chassis. I did'nt have any thin tape so I used contact glue. Big mistake which can be seen on the pic. The glue was too harsh for the gold paint so it bled through. Next thing was when inititially firing it up (no tubes installed of course) I had no bias voltage on the control grids of the powertubes which would've been not so good in case the tubes were installed. It turned out to be a resistor in the bias supply that got disconnected while soldering a wire. The wiring itself was on top and hid the fact it got unattached. Third screwup was that I heard only hum when connected to the low input on the normal channel. It showed out that I totally had missed to solder one connection on the input jack.

The end result is very pleasing. The Marshall sound is there though a bit more cream and headroom to it. There's no hum or hiss unless I dime the volume and presence like the originals. This is after all a quite faithful replica using for example old school carbon resistors known for being noisy. The specs says 150W but the powerstage hits 180W RMS clean just like my Orange (which otoh hits the roof in the preamp well before that at ~150W). The power supply is not anywhere near Hiwatt (I've measured mine to 210W RMS clean) which the much smaller lower weight transformers already had suggested.

Gibson Basses / LP Triumph control plate for sale in Sweden.
« on: September 14, 2017, 01:09:06 PM »
Just a heads up in case anyone here is interested in a (possibly?) NOS LP Triumph control plate since they are hard to come by. This is the ad and it shows the plate in pic 3:

Price tag seems to say 300SEK (translates to ~38$)

I have no affiliation with the seller except that I bought a possible prototype LP Signature pickup from him over 10 years ago. Anyway he's a quite known vintage instrument dealer here and I'd be surprised if he was unwilling to ship internationally. He also works alongside the music store Jam which is where I found his email adress:

Facebook page here:

Let me know if I can help out in any way in case anyone is interested.

The Bass Zone / Stig Pedersen (D-A-D) 2-stringed basses revisited.
« on: September 10, 2017, 05:18:18 PM »
I believe his 2-stringers have been up here before but he keeps having new ones made. Here's some new to me and the first one might be of interest for those who like old aircrafts:

These are old to me but anyway:

Pics are taken (not by me) at a recent concert i Stockholm so he actually plays them all in one set.

Gibson Basses / Flying V Custom Shop on Ebay
« on: March 10, 2014, 08:40:40 PM »
If it was'nt for the recent standard production run this would have felt more rare perhaps. Still interesting to see a Custom Shop Bass in spite of Uwe being denied ordering anything extra ordinary:

Other Bass Brands / Hagström Super Swede RI
« on: January 29, 2014, 02:54:01 PM »
Presented at NAMM though from what I understand the show specimens got stuck in customs. Made in the Czech Republic. Swedish Lundgren Pickups. Price seems to be set at 19950 SEK in Sweden (3100$). I'd expect the price will be a bit less in the U.S though.

Gibson Basses / Gibson EB-2D in Nashville or L.A
« on: February 13, 2010, 03:08:11 PM »
A bassplayer at a Swedish bass forum is going on a worktrip to Nashville and L.A soon and is hoping to spot an EB-2D at I guess preferably a store. I thought, what is the best place for a heads up? Here of course. So if anyone knows where she could find one it would be appreciated.

Gibson Basses / NOS LPB-2 5-strings at German dealer?
« on: August 06, 2009, 04:40:51 AM »
Found these two at Thomann Germany. Can't make out the serial nr's but those are the old brown vinyl/ porn interior cases from the 90's. They say B-stock and someone must have dug them out from a hidden place in the warehouse.

What's next? A bunch of old pre ww2 Dutch bicycles?

Gibson Basses / Les Paul Standard Bass question (wiring).
« on: April 20, 2009, 12:13:45 PM »
Last week this one landed on my doorstep:

Great bass but I have a question to Hr Hornung, Mr Fertig or anyone who owns or have played one. On my specimen the vol controls act as master volumes when the toggle is in center position. Is it factory correct? I thought that type of stupid wiring was exclusive on the EB-3. I found the schematics PDF at but it was was blank although schematics of the LP guitar from early 70's show the same stupid wiring. I'm going to switch the wire connections on both pots tonight (so that the pup signal is grounded not the output jack signal) but thought I'd ask anyway since the toggle is wrong also. Downwards (treble) engage neck pup only and upwards (Rhythm) is bridge pup only. Either it's been tampered with or is  installed upside down (if possible?). May or may not be a Gibson staff screw up.

Gibson Basses / Gibson make believe.
« on: April 09, 2009, 02:19:36 PM »
A guy at the Swedish bass forum had some fun with Photoshop using the new pics off the Gibson website. Mostly bass versions of guitars but some of them are really nice I think. Don't know about those SG RI tuners though.

Gibson Basses / New 2009 Grabber II and, yes, even the Ripper!
« on: February 17, 2009, 07:42:23 PM »
Looks like there will be a limited run of the Gibson Grabber (one LP TB plus pickup):

Click on New Releases and then Limited Run Series and you'll see the pic. No info yet though.

Gibson Basses / Hipshot Supertone installed on Thunderbird.
« on: June 20, 2008, 03:28:30 PM »
I'm not the first (rockinray duke has one right?)but I got myself an Aluminum Hipshot Supertone and decided to install it on my already refinned and beat up Bicentennial. This is the best playing and sounding bass I have IMO but considering the "may leave marks on body" clause I decided this was the one including the fact that the bridge was already down to the body for perfect action. After installation I noticed that the response and sound was almost the same. Maybe some more sustain and attack and I got the action a bit more lowered if I want to. The best thing about it is it is more comfortable with no saddles up your palm when picking  near the bridge. I hesitated at first to buy and install it since I did'nt want to alter the sound too much but if you think the 3 point is a hassle (I don't) to adjust this might be the right bridge for you. Maybe the higher mass brass version alters the sound more?

Edit: Haha. The pic also reveals some of my recent project but there's more to come when I finished it. Got a Victory Artist that I traded for a an amp.

Gibson Basses / Hilarious video featuring Ripper.
« on: June 16, 2008, 04:47:17 AM »
Anyone ever said the 70's was cheesy?:

Gibson Basses / LP Signature. An interesting discovery.
« on: May 11, 2008, 11:07:49 PM »
Yesterday I went to a Guitar Show in Gothenburg. I stumbled across a guy who is known for dealing with all sorts of guitar related vintage stuff and junk. He had bought a drawer (actually 4 drawers) off Krazy Kat Music in San Antonio. He had a list of what inventory he had. I immediately spotted two Mudbuckers on the list but more interesting, a Les Paul Signature bass pickup. At first I could'nt seem to find it amongst all the stuff but in the second drawer something caught my eye and a bell rang in my head thinking of this photo from Jules' site:

So this is what I got. According to the dealer it's NOS and belonging to a LP Sig Bass. What do you think?

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