https://tubegeek.de/ 2026-05-02T12:37:33+00:00 https://tubegeek.de/ https://tubegeek.de/lib/tpl/bootstrap3/images/favicon.ico text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/70s-vox-ac120 Vox AC120 The Vox AC120 is not very common. I wouldn't call it rare but I have met few people who own one and my father is one of them ;) The problem with this amp is, that there is very little information about it floating around and the available schematics are of very poor quality. So when one power amp bottle of my amp was red plating, I had no chance but to open it up and do some measurements without an official reference. My father had some hand drawn schematics which I provide in scanned… text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/1626-parts Prologue 1626/5842 Tube Amplifier parts Tubes 2x 1626 power triode [mu=5, Rp=2k2, Ua=250V, Ia=18mA, Ug=-31V] 2x 5842 driver triode [mu=43, Rp=1k8, Ua=170V, Ia=20mA, Ug=-2.2V 1x 5Y3G(T) rectifier tube Resistors 2x 250k, 0.5W 2x 5k6, 5W [B+ filter] text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/1626-prototype Prologue 1626/5842 Tube Amp prototype This project refers to Jim de Kort's 1626 project called Prologue. Im planning to use a mixer to drive the amp so I just need one stereo input. A parts list is available. I've decided to use standard 6 and 12V regulators, but ordered 3 LM350 variable voltage regulators, too. Jim de Kort does have some very useful tips on text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/1626 Prologue 1626/5842 Tube Amplifier This project refers to Jim de Kort's 1626 project called Prologue. A parts list is available. I use standard 6V regulators for the preamp tubes' heaters, and an LM350 variable voltage regulator as current source for the power stage tubes. Jim de Kort had some very useful tips on text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/1968-vox-ac30 Vox AC30 Top Boost (1968) Finally I've put up some photos from my vintage Vox AC30 Top Boost. Maybe they're of some use to you. The quest for the once broken vib channel is solved, The .1 uF cap at the tremolo on/off switch was broken and so was the cathode bypass capacitor. I did acquire some wiring schemes from text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/2007-vox-ac30-h2l-heritage Vox AC30H2L heritage limited No. 341 of 500 This is one great sounding and beautiful looking amp! text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/audiovideo-ac3-mod-larsson AC-3 Laserdisc Player Upgrading This excerpt was originally found at Colin Hunter's AC-3 website which was hosted at AOL and can only be accessed via wayback machine. It is courtesy of R Larsson who modified the article originally found in the Norwegian AudioVideo magazine. Location of the AFM (Analog Audio) Signal: text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/blue-stripe-1176 1176 (Rev. A) Blue Stripe limiting amplifier * Kit: Hairball Audio Rev. A Blue Stripe (includes PCB and all components now) * PCB: MNATS Rev. A v1.2.5 (can be ordered from Hairball) * Components: Mouser text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/crammed-chassis Crammed Chassis Unless someone has a better idea (or is less concerned than I am), I seem to buy another chassis and drill the holes myself :-( Better Layout? Maybe this is a better layout, V1 to the right above the output tranny. Power and choke to the left text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/diy Do It Yourself I'd like to give credits to Jim de Kort who planted the diy-virus in my head by simply putting that much interesting information about tubeamps and tubeamp-projects on his website <http://www.vt52.com>. Finished Projects * 1626 Integrated HiFi Tube-Amplifier * 1626 Prototype HiFi Tube-Amplifier * Pioneer CLD-2950 Laserdisc player AC3 mod * Universal Audio 1176 (Rev. A) Blue Stripe limiting amplifier clone * t.c. electronic M5000 power supply upgrade Current Projects text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/drip-fairchild-670 DRIP Fairchild 670 stereo compressor [Fairchild 670 Frontplate] This is a long-time project that started in 2010 when I bought the PCB and sourced some components. It will be finished some time ;) * Case: diy-racked.com * PCB: dripelectronics.com * Iron: Sowter F670 Fairchild 670 (Stereo) Transformer set Update 2016-01-01 Finished placement of tube sockets, jumpers and wire posts. text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/harrison-3232 Harrison 3232 I own a vintage Harrison 3232 large format inline console. It needs some TLC ;) Some more images of the channel strips and the rebuilt leather armrest: Channel strip component side: Channel strip track side: Channel strip closeups: text/html 2021-12-18T10:00:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/home What's this site about? [Vox AC30 set up for recording] I have built this site, so people like me, who enjoy building and fixing things by themselves, can use this as a source of information. It all began when I had to repair my old '68 Vox AC30 guitar amplifier. It turned out it needed a little more surgery than I text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/nakamichi-cr-4e Nakamichi CR-4e more info soon... text/html 2022-01-16T11:10:40+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/navbar * Home * Vox * Recording * Tape * Do it yourself text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/pioneer-cld-2950-ac3-mod Pioneer CLD-2950 Laserdisc player AC3 mod [Neutrik AC3-RF jack]I did an AC3 mod on my (t)rusty old Pioneer CLD-2950 PAL/NTSC Laserdisc player some time ago. I derived the circuit from <http://www.laaudiofile.com/ac3mod.html> and put the prototype of circuit #2 into a small plastic housing. I attached the wires to the various points on the PCB and to the new RCA jack (Neutrik) text/html 2020-01-12T17:08:56+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/pontiac-bonneville My '70 Pontiac Bonneville * Top View * Bottom View * Home Sweet Home * Recklinghausen Beauty... ['70 Pontiac Bonneville] ...and the beast [Also available in rat outfit] text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/recording Recording re·cord v. re·cord·ed, re·cord·ing, re·cords * To set down for preservation in writing or other permanent form. * To register or indicate: The clerk recorded the votes. * a. To register (sound or images) in permanent form by mechanical or electrical means for reproduction. text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/rectifier-parts Custom Guitar Tube Amplifier parts This is a partial list with linked sources. Parts 1x STL 2 SW/WS AC Cord 2.40 2.40 1x F1 SKU15787 Fuse Holder 6x32 Profuse 1.276 1.276 10x F1 USA-TRÄGE 2,0A Slo-Blo Fuse 2A 0.17 1.70 2x S1, S3 SKU16262 Carling SPST Toggle Switch 3.944 7.888 text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/rectifier Custom Guitar Tube Amplifier [Rectifier Power Supplies] This project is based on the Mesa Boogie Dual Rectifier guitar amp circuit. A parts list is in the making. Nick Kim and Guido Böhme have built similar amps. The original schematics of the '93 dual channel Mesa Boogie Dual Rectifier are available. [Rectifier Preamp] [Rectifier Poweramp] There are also some text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/reel-to-reel Reel To Reel text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/sony-wm-dc2-walkman Sony WM-DC2 Walkman (1986) Read more about it at Walkman Central. This is the Walkman featuring Dolby C noise reduction and a quartz locked direct drive motor. [Sony WM-DC2 Walkman] [Sony WM-DC2 Walkman] [Sony WM-DC2 Walkman] [Sony WM-DC2 Walkman] [Sony WM-DC2 Walkman] text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/studer-a80-vu Studer A80 VU MkII Remote control Headstack Transport cards Serial number / type Autolocator / Automation setup Recapping the channels text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tape Tape recorder stuff I like the sound and handling of analog tape. And I like the fact that you have to take good care of the hardware. If you have the right tools, you can do almost everything from maintenance to service yourself. Replacement parts are a little harder to obtain nowadays but at least you get replacement parts. I own the following tape recording and playback devices: text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tascam-34b Tascam 34B 4-track [Tascam 34B VU Meters] I still had a tape with some recordings I did back in 1996 on a borrowed Tascam 34. So in order to listen to it again I needed a similar recorder. The 34B was currently available and I am an unhesitant type of guy... [Tascam 34B sitting on top of the M-3500 mixer] Right now the 34B is sitting on top of the Tascam M-3500 mixer. I don't know where else to put it as space is limited and I don't use it that often so I guess it will be ok for a while. Gett… text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tascam-234l Tascam 234L syncaset [Tascam 234L VU meters] This is the low-speed version of the 234 syncaset. It has been designed to meet the need in various fields for equipment having extended tape playing time. The only difference between this model and the 234 syncaset is that the 234L's basic tape speed is 4.8 cm/sec. (1-7/8 ips), while the 234 operates at the standard speed of 9.5 cm/sec. (3-3/4 ips). All other functions and controls are identical to that of the 234 syncaset. text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tascam-atr-60-2 Tascam ATR-60/2 mastering recorder [Tascam ATR-60/2] [Tascam ATR-60/2] text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tascam-atr-60-16 Tascam ATR-60/16 recorder [Tascam ATR-60/16] [Tascam ATR-60/16] Manual Erase head Record/sync head Repro head All 3 heads without flash text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tascam-br-20 Tascam BR-20 mastering recorder [Tascam BR-20] [Tascam BR-20] [Tascam BR-20] text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tascam-m-3500-mixing-console Tascam M-3500 mixing console The mixing console is 32 channel inline mixer which means that there are essentially 64 input channels to take care of. I'd call it semi-modular since you can easily remove a set of 4 channelstrips at once. The PCBs all look pretty clean and there are no capacitors that look bad. The pots will need some cleaning since some of them crackle a bit, as do the faders. A treatment with DeoxIT D100 hopefully will cure the crackling pots and faders. I'll use contact cleane… text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tascam-m-3500 Tascam M-3500 series When you buy a used mixing console, chances are, it's going to need a good cleaning at the least. All kinds of stuff may have found its way into the housing, maybe some liquid got spilled over the console, you never know. On the following pages I try to make sure, the old mixer is cleaned up and parts which are prone to go bad over the years (drifting resistors, dryed up electrolytics) are going to be replaced. text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tascam-ps-3500-power-supply Tascam PS-3500 power supply The Tascam M-3500 mixing console is powered by the PS-3500 power supply. Big surprise. Have a look at the following photo comparison before and after the cleaning. Cleaning PCBs and components A lot of stuff can enter the power supply through the venting and when the unit heats up you can smell all the years at once. As much as I like the smell of gear, especially when it's old, you certainly don't want all the additional odors that have accumulated. I simply used… text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/tc-electronic-m5000-psu-upgrade t.c. electronic M5000 PSU upgrade While the M5000 is a truly marvellous professional effects unit from t.c. electronic, the PSU heat dissipation and ventilation design leaves a lot to be desired. The PSU gets hot, there is no fan and passive ventilation is only possible through the unit's sides. PSU failure is only a matter of time. You've got to ask text/html 2020-01-12T17:08:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://tubegeek.de/vox Vox guitar amplifiers I've always loved the sound of a 60's Vox AC30. Previous to the AC30, I had bought an AC120 which I had sold to my father to be able to buy the AC30. Later I got another AC120 when I was browsing the free ads section of Gitarre & Bass magazine. Childhood memories tempted me into buying this amp to own it again. Although it's not a very sought after amp, I find it to sound quite good, responsive, a little glassy and of course it has a lot of headroom with its 4 x EL34 power…