http://tubegeek.de/ 2012-05-21T02:44:05+02:00 http://tubegeek.de/ http://tubegeek.de/lib/tpl/tubegeek/images/favicon.ico text/html 2006-04-17T14:59:09+02:00 http://tubegeek.de/1626-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] 2x 1k8, 2W [cathode bypass] 2x 470, 5W [B+ filter] 4x 150, 0.5W 2x 110, 0.5W [cathode bypass] Capacitors 2x polyprop 100nF (.1uF), 400V [preamp decoupling] 2x electrolytic 470uF, 16V [cathode bypass] 2x electrolytic 22uF, 50V [cathode b… text/html 2011-03-20T12:48:58+02:00 http://tubegeek.de/1626-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 regulating power for filaments on his site. text/html 2010-12-06T12:56:00+02:00 http://tubegeek.de/1626 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 does have some very useful tips on regulating power for filaments on his site. text/html 2011-01-01T18:06:00+02:00 http://tubegeek.de/1968-vox-ac30 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 <http://www.voxamps.co.uk> that helped me a lot to understand what is going on in this amp. As I was searching for information on when and where the amp was built I think I have come to some conclusions with th… text/html 2011-01-30T18:02:00+02:00 http://tubegeek.de/2007-vox-ac30-h2l-heritage This is one great sounding and beautiful looking amp! text/html 2011-04-30T16:09:44+02:00 http://tubegeek.de/blog text/html 2011-10-09T18:05:31+02:00 http://tubegeek.de/blue-stripe-1176 * Case: Hairball Audio Rev. A/D Blue Stripe * PCB: MNATS Rev. A v1.2.5 * Components: Mouser text/html 2006-06-16T23:23:29+02:00 http://tubegeek.de/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 2012-02-22T14:08:05+02:00 http://tubegeek.de/diy 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 text/html 2011-10-09T18:11:24+02:00 http://tubegeek.de/drip-fairchild-670 * Case: diy-racked.com * PCB: dripelectronics.com * Iron: Sowter F670 Fairchild 670 (Stereo) Transformer set text/html 2011-05-02T22:18:29+02:00 http://tubegeek.de/home [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 [1626 HiFi Tube Amp Prototype] had anticipated but since then I was hooked on the whole DIY and tube topic. I have prototyped a HiFi Tube Amp, which has been responsible for my living room audio experience … text/html 2010-02-06T15:12:43+02:00 http://tubegeek.de/nakamichi-cr-4e more info soon... text/html 2011-04-30T16:44:44+02:00 http://tubegeek.de/navbar * Home * Blog * Vox * Recording * Tape * Do it yourself * Pontiac Bonneville text/html 2011-10-09T18:14:01+02:00 http://tubegeek.de/pioneer-cld-2950-ac3-mod 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) :-) I fitted on the players rear panel. There you go: Dolby AC3-RF encoded 5.1 signal which I can decode with my Pioneer VSX-859RDS AV-reveiver. text/html 2011-05-02T22:35:35+02:00 http://tubegeek.de/pontiac-bonneville Old cars are... well, old. * Top View * Bottom View * Home Sweet Home Beauty... ['70 Pontiac Bonneville] ...and the beast [Also available in rat outfit] text/html 2011-07-09T14:20:17+02:00 http://tubegeek.de/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 2006-04-25T01:00:42+02:00 http://tubegeek.de/rectifier-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 16x D1-D16 1N 4007 1N4007 Silicon Diode 0.02 0.32 2x RLY1, RLY2 G6H-2 6V Omron G6H-2 6VDC Relay 2.95 5.90 1x LDR3 SKU17344 Vactec VTL5C4/2 4.8256 4.8256 1x LDR10 SKU17340 Va… text/html 2006-06-16T20:18:54+02:00 http://tubegeek.de/rectifier [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 older schematics of lower quality wich feature additional voltage annotations. As the project moves along, I will provide updated schematics of my own project and th… text/html 2010-02-06T12:27:04+02:00 http://tubegeek.de/reel-to-reel text/html 2011-01-01T19:49:00+02:00 http://tubegeek.de/sony-wm-dc2-walkman 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 2011-06-09T08:16:31+02:00 http://tubegeek.de/tape I like the sound and handling of analog tape. I really do. 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 recorder stuff: text/html 2010-02-10T14:09:41+02:00 http://tubegeek.de/tascam-234l [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 2010-02-27T12:46:00+02:00 http://tubegeek.de/tascam-34b [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. Getting a nice rack and … text/html 2010-02-26T20:39:51+02:00 http://tubegeek.de/tascam-atr-60-16 [Tascam ATR-60/16] [Tascam ATR-60/16] Manual Erase head Record/sync head Repro head All 3 heads without flash text/html 2011-01-01T17:44:00+02:00 http://tubegeek.de/tascam-atr-60-2 [Tascam ATR-60/2] [Tascam ATR-60/2] text/html 2011-01-01T17:47:00+02:00 http://tubegeek.de/tascam-br-20 [Tascam BR-20] [Tascam BR-20] [Tascam BR-20] text/html 2011-01-06T07:34:00+02:00 http://tubegeek.de/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 cleaner for the switches. Some of th… text/html 2010-10-24T18:23:00+02:00 http://tubegeek.de/tascam-m-3500 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 2010-03-01T15:47:04+02:00 http://tubegeek.de/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 a household vacuum cleaner wi… text/html 2011-01-30T19:33:00+02:00 http://tubegeek.de/vox 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 amp design.