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47k B+4 EL34 or 6V6 B+5 B+3 1k5 .022uF .001uF ceramic 22k 150k 1M 10k 2k7 220uF 0.1uF Note that mid cap is connected to mid pot wiper. B+2 B+1 White 2.0A SB Fuse 160uF 350v 160uF 350v 1k/25W 220k/1W Standby Switch 220k/1W 120vac Power 1M 1k5 8 ohm 16 ohm 470R 1k5 0.1uF Presence 5kB 0.1uF Power Black Switch 0.1uF 0.1uF 820R Bass 250kB Middle 25kB 12AX7 1000 Volume 1MA .022uF 22uF 12AX7 Treble 250k 12AX7 .001uF poly 220k 100k 1M 100k 82k 500pF 100k 220k 100k 100k 12AX7 B+2 Bias 1000 B+5 Trainwreck Express Version A0 18k2 40uF 500v 20uF 500v B+5 B+4 9k1 20uF 500v Bias Adj 10kB 470R / 1W To filaments & pilot lamp B+3 100uF 100v 15k EL34 or 6V6 B+1 9k1 20uF 500v Bias Based on designs from Ken Fischer Rev. 09-29-00 100k B+4 1k5 .022uF Note that mid pot is wired up as a variable resistor. 22k 56k 1M 10k 2k7 22uF 0.1uF B+1 ~410vdc White 2.0A SB Fuse 160uF 350v 160uF 350v 1k/25W 220k/1W Standby Switch B+2 220k/1W 120vac Power 470R 8 ohm 16 ohm 1k5 .022uF Similar to: Hammond P-T1650H Presence 5kB 0.1uF Power Black Switch 1M 1k5 220k 820R Bass 250kB Middle 25kB .022uF 0.1uF 1000 .022uF 12AX7 .001uF Volume 1MA 1M 100k 82k 100k 12AX7 Treble 250kA 12AX7 100k 220k 100k 500pF 22uF Bias B+3 100k 12AX7 B+2 EL34 or 6V6 B+5 1000 B+5 Trainwreck Express Version A1 B+3 18k2 40uF 500v 9k1 20uF 500v 20uF 500v 15k Version One from... "The Mystery Man" 9k1 10uF 100v 10uF 100v B+1 20uF 500v 47k Bias Adj 20kB 220k To filaments & pilot lamp B+5 B+4 EL34 or 6V6 Bias Based on designs from Ken Fischer Rev.09-29-00 .022uF Note that mid pot is wired up as a variable resistor. Bass 250kB 10k 150k 1M 10k 12AX7 2k7 22uF 0.1uF B+1 ~410vdc 160uF 350v 2.0A SB Fuse 160uF 350v 1k/25W 220k/1W Standby Switch B+2 220k/1W White 1k5 220k 8 ohm 16 ohm 470R 1k5 .022uF Similar to: Hammond P-T1650H Presence 5kB 0.1uF 120vac Power 1M 82k .002uF 100pF Middle 25kB .022uF 0.1uF 1000 1k5 Volume 1MA B+2 EL34 or 6V6 12AX7 220k .022uF 500pF 100k 100k 1M 12AX7 100k Treble 1M 100k Power Black Switch Bias B+3 500pF 22uF B+4 B+5 100k 12AX7 100k 1000 B+5 Trainwreck Express Version A1a B+3 18k2 40uF 500v 9k1 20uF 500v 20uF 500v 15k Version Two from... "The Mystery Man" 9k1 10uF 100v 10uF 100v B+1 20uF 500v 47k Bias Adj 20kB 220k To filaments & pilot lamp B+5 B+4 EL34 or 6V6 Bias Based on designs from Ken Fischer Rev.09-29-00 1M .022uF 22uF 1k5 .022uF Note that mid pot is wired up as a variable resistor. 500pF Volume 1MA Bass 250kB 12AX7 100k Treble 1M 100k B+3 100k 12AX7 10k 150k 1M 10k 12AX7 Middle 25kB 2k7 22uF 0.1uF B+1 ~410vdc White 160uF 350v 2.0A SB Fuse 160uF 350v 1k/25W 220k/1W Standby Switch B+2 220k/1W 120vac Power 1M 1k5 8 ohm 16 ohm 470R 1k5 .022uF Similar to: Hammond P-T1650H Presence 5kB 0.1uF Power Black Switch .022uF 0.1uF .002uF 100pF B+2 EL34 or 6V6 1000 500pF Bias 1000 ???pF 220k ???k B+4 B+5 220k 12AX7 Tone stack reportedly bypassed with RC network on some amps. 82k 100k 100k 100k B+5 Trainwreck Express Version A1b B+3 9k1 18k2 40uF 500v 20uF 500v 20uF 500v 15k Version Two from... "The Mystery Man" 9k1 10uF 100v 10uF 100v B+1 20uF 500v 47k Bias Adj 20kB 220k To filaments & pilot lamp B+5 B+4 EL34 or 6V6 Bias Based on designs from Ken Fischer Rev.09-29-00 100k B+4 B+5 1k5 .022uF 22k 56k Bass 250kB Middle 25kB 10k 220uF 2k7 0.1uF Note that mid cap is connected to mid pot wiper. B+1 120vac Power White Standby Switch 160uF 350v 2.0A SB Fuse 220k 8 ohm 16 ohm 1k5 0.1uF Output Transformer 5k primary Presence 5kB 0.1uF Power Black Switch 470R 82k 820R 1k5 1k5 .022uF 22uF 0.1uF 0.1uF .001uF Volume 1MA 1M B+2 EL34 12AX7 100k 100k 12AX7 Treble 1M 100k 1M 50pF 12AX7 100k 220k 100k 1M 12AX7 Bias B+3 1k5 B+5 Trainwreck Express Version A2 160uF 350v B+2 1k/25W 18k2 220k 40uF 500v 9k1 20uF 500v B+1 9k1 20uF 500v 220k Bias Adj 10kB 470R / 1W To filaments & pilot lamp 20uF 500v B+5 B+4 B+3 EL34 100uF 100v 15k Bias Inspired by designs from Ken Fischer Rev.09-29-00 47k B+4 EL34 or 6V6 B+5 1k5 47k 33k Bass 1M Middle 25kB .022uF 10k 2k7 22uF 0.1uF Note that mid cap is connected to mid pot wiper. 8 ohm 16 ohm 5k6 0.1uF Similar to: Hammond P-T1650H Presence 5kB 0.1uF B+1 325vdc Standby Switch Power Black Switch 120vac Power White 1k 220k 820R 5k6 1500 .022uF 22uF .001uF Volume 1MA 1M 0.1uF 0.022uF 82k 33k 12AX7 Treble 250k 12AX7 100k 68k 100k 1M 500pF 12AX7 100k 220k 100k 1M 12AX7 B+2 Bias B+3 1500 B+5 Trainwreck Express Version A3 B+2 1k/25W 100uF 350v B+3 18k2 40uF 500v 20uF 500v B+5 B+4 9k1 20uF 500v EL34 or 6V6 B+1 "How's it sound? Like the first Van Halen album..." 9k1 20uF 500v 2.0A SB Fuse Bias Adj 10kB 470R / 1W 100R 100R To filaments & pilot lamp 100uF 100v 15k Bias A DIY clone inspired by designs from Ken Fischer Rev.09-29-00 100k B+4 EL34 or 6V6 B+5 .022uF 22uF 1k5 10k 56k Bass 250kB Middle 25kB .022uF 820R 10k 2k7 22uF 0.1uF Note that mid cap is connected to mid pot wiper. B+1 80uF 350v 2.0A SB Fuse 80uF 350v 220k/1W 120vac Power 1k/25W 220k/1W Standby Switch Power Black Switch B+2 18k2 20uF 500v 1k5 .022uF Similar to: Hammond P-T1650H 100R To filaments & pilot lamp 20uF 500v 9k1 20uF 500v 100uF 100v 15k EL34 or 6V6 B+5 B+4 Bias Adj 10kB 470R / 1W 100R B+3 9k1 20uF 500v Bias 16 ohm 8 ohm Presence 5kB 0.1uF White 470R 1k5 1000 .001uF Volume 1MA 1M .022uF 0.1uF 82k 100k 12AX7 Treble 250kA 12AX7 100k 47k 100k 1M 500pF 12AX7 150k 220k .002uF 220k 100k 1M 12AX7 B+2 Bias B+3 1000 B+5 Trainwreck Express Version A4 "When the guitar volume is on 10, this is the meanest amp I own; feedback swells into higher harmonics above the note, the low end doesn't mush out, thick mids yet clear top end. When the guitar volume is rolled off, it becomes one of the sweetest and jangliest amps I've got." B+1 390vdc (EL34) 410vdc (6V6) A DIY clone inspired by designs from Ken Fischer Rev.09-29-00 The Blues Express Version A5h B+5 285vdc B+5 250pF 50pF mica 185vdc 47k Treble 1MA Sovtek Input Trim 1MA 22k 1uF poly 20uF 100k Volume 1MA .022uF 418P .022uF 418P 250pF 100k 12AX7WB 100k 1.49vdc 1k5 20uF White To Fils 1uF poly 5k6 MV 1MA 1M 56.1vdc 56k B+5 B+2 B+3 B+4 333vdc 319vdc 301vdc 285vdc (351vdc) (337vdc) (318vdc) (301vdc) 1k/5W 9 2 3 220k 220k 0.22uF 330vdc 1k 5W B+2 10.89vdc 270k 220k 20uF 450v 220k 4k7 20uF 450v 9k1 20uF 450v .022uF 418P EL84 5k6 B+1 1k 5W 3 Bias –12.5v Fixed Bias Switch 2 130/5w 9 344vdc 8 ohm 330vdc Speaker: Jensen P10-Q 7 EL84 25uF 9k1 20uF 450v "This amp was fine-tuned for blues tones, with a sparkling clean sound that gets more aggressive when you crank up the volume. It sounds like an old BF amp on Viagra..." Revisions from Versions 2 & 5 shown in RED Hi-V Sw Bias –12.5v Bias Adj 10kB 100uF 100v .022uF 418P 261vdc 1k5 20-0-20vac 470R / 1W 7 344vdc 10k 100uF 350v 5 - 10v / 5w zeners 100R 2.94vdc 56k 100uF 350v 1.5A SB Fuse 12AX7LPS .022uF 418P 20.8vdc 57.8vdc 4 - 1N4007 120vac Power 56k 270vdc 2k7 Middle 25kB KT-17620 336vac Sovtek Sovtek 209vdc 1.99vdc Bass 250kB 100k 12AX7LPS .001uF 418P B+1 344vdc (364vdc) Power Black Switch 318vdc 300vdc 100k 12AX7WB B+3 B+4 285vdc 0.22uF poly Sovtek This is the final version of the Blues Express amp. The zener limiting circuit was removed and a modified cross-line MV was installed in its place. The bias/grid load resistors were returned to their original value of 220k. The 2nd stage supply was rewired to B+5 instead of B+4 and the 0.22uF/630v poly cap from B+5 to ground was drawn in. 10k Inspired by designs from Ken Fischer Rev.11-13-00 22k B+4 B+4 .022uF 25uF 1k5 .022uF Note that mid cap is connected to mid pot wiper. 100pF .0047uF Volume 1MA 22k 100k Bass 250kB 1M 2k7 25uF V1B 5k6 Can run V2B in parallel w/V2A: 47k plate w/ 1000pF 1k cathode resistor B+1 ~500vdc White Slo-Blo Fuse 100uF 350v 10k 220k/1W 100uF 350v B+3 20uF 500v 20uF 500v 10uF 100v 10uF 100v 0.1uF V3A 1k5 .022uF Similar to: Hammond P-T1650H (Can wire up to UL taps using 1k screen resistors.) EL34 or 6550 B+1 One cloner's take on the Express design. 6k8 20uF 500v 15k Bias Adj 10kB To filaments & pilot lamp 8 ohm 16 ohm 470R B+4 Bias 15k 1k5 V5 Choke 220k/1W 120vac Power Standby Switch B+2 1M 2k 12AX7 Middle 25kB Can use 12AU7 for V2 Power Black Switch .022uF 0.0047uF 1000 1M V3A V2A V4 12AX7 100k 82k 100k 12AX7 220k Treble 250k B+3 B+2 EL34 or 6550 100k 250pF Bias 100k 500pF V1A 100k 12AX7 100k 1000 B+4 Trainwreck Express Version A6 Based on designs from Ken Fischer Rev.09-29-00 Trainwreck Express Version A7 100k B+5 B+4 B+5 820 470k Bass 1MA 470k 1uF 80uF 450v 2.0A SB Fuse 80uF 450v 470R/10W 220k/1W Standby Switch B+2 220k/1W White V1B Presence 5kB 0.022uF V3A 0.68uF B+1 ~450vdc 120vac Power 2k7 470R 1M 10k 12AX7 40uF 500v B+3 22k 22k 10uF 500v 15k 10uF 100v 10uF 100v .022uF Can add post-PI MV here (like Matchless Spitfire) Similar to: Hammond P-T1650H V5 Voodoo Amps "Blue-Tone" Amp 22k 10uF 500v B+1 47k Bias Adj 20kB 220k To filaments & pilot lamp 20uF 500v 1k5 EL34 B+5 B+4 8 ohm 16 ohm 39k Middle 50kB Note that mid cap is connected to mid pot wiper. 1M .001 56k 1k5 1k5 Volume 1MA 1uF .022uF .022uF .022uF 1k5 .022uF V4 100k 1M V3A .001 V2A 82k 47k 12AX7 100k Treble 250k B+2 EL34 12AX7 100k 100k 680pF 68k Power Black Switch Bias B+3 V1A 100k 12AX7 100k Bias Based on designs from Ken Fischer Rev.09-30-00 Blues Express Plus Version A8a B+3 B+5 B+5 285vdc 300vdc Smooth Switch 0.22uF poly 100k 100k 12AX7WB 50pF mica 185vdc 47k 22M Input Trim 1MA 22k 20uF .022uF 418P .0068uF .0016uF 715P 715P Sovtek 2k7 56k 12AX7LPS .022uF 418P 20.8vdc 82k 2.94vdc 1M 1k5 56k 1uF poly .022uF 418P 5k6 MV 1MA 3 150k 150k 0.22uF 180k .022uF 418P Power Black Switch KT-17620 336vac 120vac Power White 1.5A SB Fuse 220k 20uF 450v 100uF 350v 100R 220k 100uF 350v 5 - 10v / 5w zeners To Fils Hi-V Switch Bias –12.5v 20-0-20vac Bias Adj 10kB 470R / 1W 100uF 100v 10k 4k7 20uF 450v 330vdc 5k6 1k 5W Bias –12.5v 9 344vdc 9k1 9k1 20uF 450v 20uF 450v Fixed Bias Switch 25uF 8 ohm B+1 3 2 130/5w 0.022uF 630v 1k 5W 0.033uF 630v 10k 10W 330vdc Speaker: Jensen P10-Q 7 EL84 B+5 B+2 B+3 B+4 333vdc 319vdc 301vdc 285vdc (351vdc) (337vdc) (318vdc) (301vdc) 1k/5W 4 - 1N4007 EL84 B+2 10.89vdc 270k Fat Switch B+1 344vdc (364vdc) 9 2 10k 56.1vdc 20uF 7 344vdc 261vdc 57.8vdc 100k 12AX7WB Middle 25kB Sovtek 270vdc 1.99vdc Bass 250kB 100k 209vdc 100k Volume 1MA 1uF poly 12AX7LPS 22M 100k .022uF 418P Sovtek .047uF Treble 1MA 1.49vdc 1k5 318vdc B+4 285vdc Sovtek The Blues Express Plus adds a "Fat" switch to allow for more Marshall-ish sounds by using a switchable .0068uF coupling cap after the second stage. In the other modes this cap is run in series through a .0016uF cap which results in a net capacitance of 1295pF. A center-off DPDT switch was used to toggle the grid load of the 3rd stage from 56k to 82k in the two "blues" modes, while dropping to 45k to cut the gain a bit in the "Fat" mode. Conjunctive Filter Switch The switchable conjunctive filter was used to smooth out the response of the amp, making the 250pF caps across the 2nd and 3rd plate resistors unnecessary. With the .022uF and .033uF caps in series the net capacitance is .0132uF. The Smooth switch is a local feedback loop between the plate and grid of the 2nd stage. The traditional value of 22M allows for a compressed sound while the alternate value of 44M has a more subtle effect. Revisions from Versions 2 & 5 shown in RED Inspired by designs from Ken Fischer Rev.05-03-01 Blues Express Plus Version A9h The Blues Express Plus is a radical reworking of the Blues Express chassis along the lines of more traditional Trainwreck designs. The conjunctive filter is the key to getting a smooth response from this preamp with the output section using the stock Electar Tube 30 OT; without the conjunctive filter the sound would be extremely brittle and harsh. B+5 285vdc 0.22uF poly Sovtek 100k B+3 B+5 50pF 1kV 12AX7WB 318vdc B+4 285vdc 300vdc 185vdc Bright Switch 1M 20uF 1.49vdc Treble 1MB 1k5 1uF poly .0015uF 715P 100k 200k .022uF 418P .022uF 418P 250pF 1kV (2 - 4M7) 150k Bass 250kB Sovtek 270pF 1kV 820R Volume 1MA 1uF poly 20uF KT-17620 336vac 1k/5W 220k 20uF 450v 220k 100uF 350v 5 - 10v / 5w zeners To Fils Hi-V Switch Bias Adj 10kB 470R / 1W 100uF 100v 5k6 MV 1MA 0.22uF 9 2 3 150k 150k 330vdc 56k 4k7 20uF 450v 9k1 9k1 20uF 450v 20uF 450v .022uF 418P Bias –12.5v 5k6 2 1k 5W 9 344vdc .047uF 630v 25uF 10k 10W 330vdc Speaker: Jensen P10-Q 7 EL84 Fixed Bias Switch 8 ohm B+1 3 130/5w 0.033uF 630v 1k 5W B+2 10.89vdc 270k 50pF 56.1vdc EL84 Conjunctive Filter Switch The 3 position Bright Switch is an important control as it allows for chimey and clear sounds at lower settings of the volume control. Because of the series linkage the low capacitance setting works out to 129pF. I like to turn up all of the controls to 10 (going through a Marshall Power Brake when necessary) and then fiddle with the controls on the guitar to get clean, crunchy or downright distorted tones. Bias –12.5v 20-0-20vac Revisions from Versions 2 & 5 shown in RED .022uF 418P 10k B+5 B+2 B+3 B+4 333vdc 319vdc 301vdc 285vdc (351vdc) (337vdc) (318vdc) (301vdc) 100uF 350v 100R 7 344vdc 261vdc 1k5 * Use 56k to 150k. This will set amount of gain & distortion. 4 - 1N4007 120vac Power White 1.5A SB Fuse 56k 57.8vdc 1200pF 1kV 1M 2.94vdc 2200pF 68k * 1kV B+1 344vdc (364vdc) Power Black Switch 20.8vdc 209vdc 1.99vdc Middle 25kB .022uF 418P Sovtek 12AX7LPS Sovtek 12AX7LPS 270vdc 2k7 100k .005uF 418P 12AX7WB 100k 50pF 10k Inspired by designs from Ken Fischer Rev.05-20-01 Blues Express Plus Version A9k B+5 The Blues Express Plus is a radical reworking of the Blues Express chassis along the lines of more traditional Trainwreck designs. The conjunctive filter is the key to getting a smooth response from this output section (which doesn't use NFB). Without the conjunctive filter the sound would be extremely brittle and harsh. In this revision a split load is used on the 2nd stage and a switch was added to lower the PI input capacitance. 285vdc 0.22uF poly Sovtek 100k 39pF 1kV 185vdc 100k 1k5 20uF 1uF poly Bright Switch .022uF 418P .022uF 418P Treble 1MB Bass 250kB 250pF 1kV (2 - 4M7) Volume 1MA .0015uF 715P .005uF 68k 418P Sovtek 12AX7LPS 50pF 1kV Sovtek 12AX7WB 270pF 1kV 820R 209vdc EL84 12AX7LPS 100k .022uF 418P 56k 33k 2200pF 1kV Fat Switch 270vdc 2.94vdc 56k .022uF 418P 47k 1200pF 1kV .01uF 418P 1M Power Black Switch KT-17620 336vac 120vac Power B+3 B+2 B+4 B+5 333vdc 319vdc 301vdc 285vdc (351vdc) (337vdc) (318vdc) (301vdc) White 220k 20uF 450v 100uF 350v 1.5A SB Fuse 100R 220k 100uF 350v 5 - 10v / 5w zeners To Fils Revisions from Versions 2 & 5 shown in RED 150k 20uF 450v 9k1 20uF 450v .022uF 418P Bias –12.5v Fixed Bias Switch 5k6 B+1 1k 5W 3 2 130/5w 0.022uF 630v 1k 5W B+2 (10.89vdc) 0.22uF 330vdc 9 344vdc .047uF 630v OT: New Sensor NSC041318 8 ohm Green Red 10k 10W 330vdc Blue 7 EL84 Black Speaker: Jensen P10-Q Conjunctive Filter Switch 25uF 9k1 20uF 450v In this version the stock OT has been replaced with a New Sensor Deluxe OT, stock # NSC041318 This OT does not have as much problem with oscillations as the stock OT, and the low end is much fuller. Bias –12.5v Bias Adj 10kB 100uF 100v 4k7 Brown Hi-V Switch 20-0-20vac 470R / 1W 3 150k 270k 50pF 56k 1k/5W 4 - 1N4007 9 2 10k Gain Switch B+1 344vdc (364vdc) MV 1MA 57.8vdc 56.1vdc 1uF poly 5k6 20.8vdc 1k5 2k7 20uF 7 344vdc 261vdc 1.99vdc Middle 25kB 318vdc B+4 300vdc Sovtek 22pF Mica 1.49vdc 1M B+3 B+5 285vdc 12AX7WB 10k Inspired by designs from Ken Fischer Rev.07-04-01 Notes on WRECKXPR.PDF Version Number: Notes A0: This is supposed to be pretty close to a real Express. Certain rumors were added in like the parallel coupling caps between the 2nd and 3rd stage A1 and A1a: These came from someone who has seen the inside of a real Express... and lived to tell about it. I suspect that A1a is more accurate than A1 A1b: Similar to A1a, but I drew in a possible RC network bypassing the tone stack that was reportedly seen on at least one Express. A2: This is probably based on Callaham clone and not a real Wreck. The 50pF treble cap, 1M treble cap and .001uF/56k cap/resistor after the 2nd stage all contribute to a brighter, less gainy sound than is produced by a real Express. (It was this schematic that was originally distributed as the Trainwrecked Expresso.) A3: This schematic is based on a DIY clone. A4: This schematic is based on a different DIY clone. A5h: This is the final version of the original lower gain Blues Express amp (which was based on the Callaham schematic in version A2). Chimey like a Vox or BF Fender at lower gain settings, but when cranked up it was more like the Vox. A6: This was reportedly based on one of Allesandro's amps. A7: This was a clone built by Voodoo Amps. A8a: This was an early rebuild of the Blues Express after I added a conjunctive filter to version A5h. A9h: This is the final version of the Blues Express Plus. Note that the 47k grid stopper on the 1st stage and the 100k grid stopper on the 2nd stage have been eliminated, and except for the various mode switches is closer to version A2 than the earlier incarnations of the Blues Express/Plus.
