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VHT SPECIAL 6 ULTRA 6-Watt Vacuum Tube High-Gain Guitar Amplifier User Manual TABLE OF CONTENTS PRODUCT SAFETY INFORMATION.................1 OVERVIEW.............................................................2 FEATURES.............................................................3 CONTROL PANEL FUNCTIONS.....................4-5 REAR PANEL FUNCTIONS.............................6-7 BLOCK DIAGRAM................................................8 TONE CONTROL GRAPHS..........................9-12 DEPTH CONTROL GRAPH..............................13 TEXTURE CONTROL GRAPH.........................14 SCHEMATIC........................................................15 TECHNICAL SPECIFICATIONS......................16 IMPORTANT SAFETY INSTRUCTIONS 1) Read these instructions. 2) Keep these instructions. 3) Heed all warnings. 4) Follow all instructions. 5) Do not use this amplifier near water. 6) Clean only with dry cloth. 7) Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. 8) Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. 9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. 10) Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. 11) Only use attachments/accessories specified by the manufacturer. 12) Unplug this amplifier during lightning storms or when unused for long periods of time. 13) Refer all servicing to qualified service personnel. Servicing is required when the amplifier has been damaged in any way, such as powersupply cord or plug is damaged, liquid has been spilled or objects have fallen into the amplifier, the amplifier has been exposed to rain or moisture, does not operate normally, or has been dropped. 14) The amplifier shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases, shall be placed on the amplifier. 15) This amplifier shall be connected to a mains socket outlet with a protective earthing connection. 16) The power/mains plug or amplifier coupler is the disconnect device which must remain readily operable. WARNING To reduce the risk of fire or electric shock, do not expose this amplifier to rain or moisture. 1 VHT 36W Handwired Head • Manual VHT SPECIAL 6 ULTRA MORE GAIN! MORE FEATURES! MORE FUN! With its additional preamp gain stage, amazing power-attenuating Watts control, tube-driven effects loop, Line Out jack, 11-position Depth control and 3-position Texture switch, the new high-gain Special 6 Ultra rockets the popular Special platform to the next level. The Special 6 Ultra’s added gain stage provides plenty of overdrive for searing leads, bone-crushing crunch, and gristly grind, while its amazingly effective Watts control can reduce the volume to whisper-quiet bedroom practice levels — while maintaining the same overdriven tone, texture and dynamic feel. We think you’ll agree — it’s truly amazing. The Special 6 Ultra features the same unique Volume and Tone controls as the original Special 6, the same footswitchable Boost, High/Low Power switch, and a similarly mod-friendly eyelet board. The Special 6 Ultra also features a unique 11-position Depth control that fine-tunes the low-frequency depth and extension. Similarly, the 3-position Texture switch fine-tunes the high-frequency extension, harmonic content and texture. Inspired by vintage studio EQs like the legendary Pultec EQP-1A, etc., these innovative tone-sculpting features allow you to precisely fine-tune the amp’s output stage frequency response and character to perfectly suit a wide range of guitars, pickups, speakers, and musical styles — like a built-in post-production Pultec mastering EQ. The Special 6 Ultra Combo and Head share the same chassis, circuit design, and component layout. 2 CONTROL PANEL FEATURES VHT SPECIAL 6 ULTRA FEATURES 6 Watts Maximum Output Power One 6V6 Output Tube Two 12AX7 Preamp Tubes Ultra (high gain) and Clean Inputs Ultra (high gain) Control Volume and Tone Controls Footswitchable Boost Mode Tube-Driven Effects Loop Tube-Driven Preamp Line Out 11-Position Depth Control 3-Position Texture Switch High/Low Power Switch Watts Control 12” VHT ChromeBack Speaker, 60-watt, 16 ohm (Combo Only) Switchable 4, 8, or 16 Ohm Speaker Output Mod-friendly Eyelet-Type Board Hand-Wired in China 3 4 1 2 3 6 5 7 8 9 10 11 12 1. Power Switch: This switch turns the amplifier on or off. 2. High/Low Power and Standby switch: The Low-Power (triode mode) setting reduces the amplifier’s maximum output power to approximately one-half of the Full Power (pentode mode) setting. Low-Power mode produces a richer and smoother tone, with earlier breakup than HighPower mode. The middle position is Standby mode. 3. Watts Control: The Watts control adjusts the output tube’s operating voltage and maximum output power. Maximum Output power ranges from ½ watt (fully counterclockwise) to 6 watts (fully clockwise). 4. Jewel Light: This light will be illuminated when the Power switch is in the On position; the jewel light will be off when the Power switch is in the Off position. 4 CONTROL PANEL FEATURES CONTINUED 5. Depth Control: This 11-position rotary switch selects the output tube’s low-frequency roll-off point. Set fully clockwise for the deepest lowfrequency extension. Lower settings (counterclockwise) expose more midrange texture and detail; the lowest settings emphasize more presence and bite. 6. Texture Switch: This 3-position rocker switch selects the output’s high-frequency roll-off point. The middle position provides maximum top-end extension and the most harmonically complex texture; the left position provides subtle high-frequency roll-off for a slightly smoother texture; the right position rolls-off more high frequencies for the smoothest texture. 7. Tone Control: This control adjusts the balance of the high and low frequencies. 8. Volume Control: Turning this knob clockwise increases the preamp drive and overall sound level. The Volume control is functional when using either Clean or Ultra inputs. 9. Pull Boost: Pull this knob to partially bypass the internal tone shaping/voicing circuitry, which boosts the preamp gain and increases the midrange emphasis. This feature can also be accessed by the footswitch. NOTE: THE BOOST FOOTSWITCH WILL ONLY FUNCTION WHEN THE VOLUME KNOB IS IN THE PULLED POSITION. 10. Clean Input Jack: Use this input when cleaner lower-gain tones are desired. (When using the Clean input, turn the Ultra knob off to reduce preamp noise.) 11. Ultra Control: This control adjusts the level of the extra gain (the Ultra control only functions when using the Ultra input). 12. Ultra Input Jack: This input engages the additional Ultra gain stage for maximum overdrive. REAR PANEL FEATURES 1 2 3 4 5 6 1. Footswitch Jack: Plug the Boost footswitch into this jack. NOTE: THE BOOST FOOTSWITCH WILL ONLY FUNCTION WHEN THE VOLUME KNOB IS IN THE PULLED POSITION. s2. Effects Loop Send and Return Jacks: The post-preamp Effects Loop can accommodate a wide range of effects. The send level is dependent on the preamp gain. High preamp gain levels may overdrive some sensitive guitar-level effects pedals. 3. Line Out Jack: The preamp Line Out is in parallel with the Effects Loop Send and Return jacks, it can be used to send a tube-buffered low-impedance (unbalanced) signal to other equipment such as mixing consoles or other amplifiers. Multiple Special 6 Ultra amplifiers can be linked by connecting the Line Out jack to the Effects Return of the second amplifier. Several Special 6 Ultras can be linked in this manner, with the first amplifier’s preamp serving as the master preamp for all additional amplifiers. 5 6 REAR PANEL FEATURES CONTINUED 4. Impedance Selector: This 3-position slide switch selects the appropriate output impedance to match your speaker cabinet’s impedance. 5. Speaker Output Jacks: These two jacks are wired in parallel. The Special 6 Ultra combo has a 16-ohm speaker that is connected to the internal speaker jack. The combo’s speaker remains connected when using the external Speaker Output jacks. When using the combo with an additional speaker cabinet, switch the Impedance selector to 8 ohms. 6. Power IEC Receptacle: Use the included power cord with this unit in accordance with the AC line voltage and frequency ratings listed on this manual and rear panel of this amplifier. For lowest noise and safest operation, always provide the amplifier with proper AC grounding. 7 BLOCK DIAGRAM Line Out Ultra Input V1A Ultra Level Clean V1B Tone Stack Pull Boost Volume Tone V2A Send Receive V2B V3 Depth Watts Texture Speaker 8 TONE CONTROL - CLEAN INPUT (NO BOOST) 9 TONE CONTROL - CLEAN INPUT (PULL BOOST) 10 TONE CONTROL - ULTRA INPUT (NO BOOST) d B r TONE CONTROL - ULTRA INPUT (PULL BOOST) +10 +10 +5 +5 +0 +0 -5 -5 -10 -10 -15 -15 -20 -20 -25 -25 -30 -30 -35 -35 -40 -40 -45 -45 -50 -50 -55 -55 -60 -60 -65 -65 -70 20 50 100 200 500 1k 2k 5k 10k 20k d B r -70 Hz 11 12 DEPTH CONTROL d B r TEXTURE CONTROL +20 +20 +18 +18 +16 +16 +14 +14 +12 +12 +10 +10 +8 +8 +6 +6 +4 +4 +2 +2 +0 +0 -2 -2 -4 -4 -6 -6 -8 -8 -10 -10 -12 -12 -14 -14 -16 -16 -18 -18 -20 -20 -22 -22 -24 -24 -26 -26 -28 -28 -30 13 20 50 100 200 500 1k Hz 2k 5k 10k 20k d B r d B r d B r -30 14 3 4 Ceramic R2 1M R3 1K5 Ceramic C8 1u/100V 2 FILM C11 101/500V C10 103/500V VR1 1M R7 1M R9 1K5 FILM 473/400V C14 2u2/63V 220mV AC T T NC G NC G FOOT SWITCH TP3 1.5V DC 1.5V DC TP2 1 2 R12 68K JK6 LINE OUT 104V DC R17 470K R18 1K5 R20 R19 100K Push/Pull Pot Push=Shunt (Clean) Pull=NC (Boost) C20 224/630V 1K5 JK4 T T NC G NC G SEND R21 100K JK5 3 R27 1M S1C R28 1M S1D R29 1M S1E R30 1M S1F R31 1M S1G S1H R32 1M R33 1M S1I R34 1M S1J S1K R35 1M R36 1M R38 C21 103/500V Ceramic TP9 T T NC G NC G C24 224/100V FILM C25 334/100V FILM C26 474/100V FILM C27 684/100V C28 1u/100V FILM FILM C29 2u2/63V C30 3u3/63V C31 4u7/63V C32 10u/63V C33 15u/63V 5K6 S4 TEXTURE C50 2u2/100V (I) 350V DC C53 0.1/630V TEST CONDITIONS: 1. WATTS & DEPTH TO MIN 2. TONE TO CENTER 3. ULTRA & CLEAN VOLUME TO MAX 323V to 25V DC TP14 TP15 308V DC WATTS R44 470K R45 100K B+1 ZD1 12V 1W C42 C41 47u/450V 104/600V G B C45 C44 22u/450V C43 22u/450V 104/600V C46 104/600V T6.3AL/250V SLOW BLOW F2 C3 22u/450V GREEN 2 V3B 6V6GTW 7 BR1 25A R50 100R V1C 12AX7 R52 220R C47 RED D5 LED (RED) V2C 12AX7 TP18 A WHT R51 100R Title 15 Size VHT Special 6 Ultra Number: Revision Rev5.0 A3 Date: 1 2 3 4 5 6 3/10/2011 7 8 Black vinyl and black grille cloth Dimensions (H x W x D): Combo: 18’’ x 19.5’’ x 10.5” (457mm x 495mm x 267mm) Head: 10.25” x 19.5’’ x 9.75’’ (257mm x 495mm x 250mm) 6.2V DC GREEN Controls: Ultra, Volume (with Pull-Boost), Tone, Texture, Depth, Watts, High/Low Power Cabinet:Finger jointed birch plywood Cosmetics: C4 104/600V D4 1N4007 RED One 12” VHT ChromeBack (60-watts, 16 ohms) B+4 1K 3W Q1 MTP6N60E R46 100K TP17 R49 10K B+2 R48 288V DC TP16 5 NTC(10R/5A) NF72-10D15 WHITE 470K 1N4007 8.2n/1KV 2 4 J6 C38 VR4 1M 9 A J4 D3 R43 330R 5W C40 104/600V 5 YELLOW/GREEN WHITE RT1 BLACK C39 R47 10R 5W 9 WHITE R41 R42 10K 4 J5 IEC IN4007 8.2n/1KV 12000u/16V POWER SWITCH T1AL/250V SLOW BLOW F1 BLACK J3 S2 BLACK BLACK STB FULL/HALF C48 0.1/630V AC C37 IN4007 8.2n/1KV 326V to 26V DC B+3 3 D2 F3 1 RED T1 STBY PENTODE ON STBY ON S3 T0.5AL/250V SLOW BLOW 47u/450V C36 TRIODE TP13 8.2n/1KV D D1 FILM S C35 B JK8 EXT SPK2 C51 3u3/100V (II) FILM Speaker (combo only): Tubes:Two 12AX7; One 6V6 T T NC G NC G 4ohm 6 watts Amp Type:Hand-wired high-gain single-ended tube T T NC G NC G 8ohm R54 15R 10W TP11 Maximum Output Power: 12" 16 OHMS JK7 EXT SPK1 Black 0 ohm 19V DC R39 470R 5W C JK9 INTERNAL SPK Yellow 4 ohm 16ohm V3A 6V6GTW R37 220K C34 22u/63V Brown 8 ohm Blue 4 R40 470R 3W 5 Name/Model:VHT Special 6 Ultra 6-Watt High Gain Vacuum Tube Guitar Amplifier / VHT Special 6 Ultra Power Requirements & Consumption: 100/115VAC, 50/60Hz; 120VAC, 60Hz; 220VAC/230VAC240/VAC, 50/60Hz TP10 TP12 Red T2 Orange 16 ohm 1, 8 S1B 1.2V DC C22 4u7/63V FILM DEPTH R26 1M (0.5W) R24 1K5 300mV AC TP7 S1A FILM 6V AC B+1 C V2B 12AX7 T T NC G NC G RETURN 300mV AC 1P-11T ROTARY SWITCH 7 33K R22 1M TECHNICAL SPECIFICATIONS C23 472/400V D R23 TP6 S1/VR1 JK3 TP5 V2A 12AX7 R16 6K8 FILM G G NC T NC T 3 6 V1B 12AX7 Ceramic Ceramic Ultra 7 33K 3 T T NC G NC G JK2 CLEAN R6 5.6K R25 220K TP8 472/400V C2 101/500V FILM Mica 3 C1 103/500V C9 152/500V C7 101/500V V1A 12AX7 3 2 R1 68K R8 B+3 300mV AC C15 C18 221/500V Mica (Cy2-2A) 471/500V Mica (Cy2-2A) R13 180K R11 CLEAN TONE R14 100K VR2 C19 VR3 27K 1M C16 C13 2 2 1M 101/500V FILM 103/630V Mica 104/400V R15 FILM 33K C17 C49 1 T T NC G NC G R5 470K 3 JK1 ULTRA C12 10P/500V Mica 1 D TP4 FILM Mica 8 7 B+3 R10 100K 120mVAC C6 222/630V 8 C5 10P/500V TP1 B+4 R4 100K 1 8mVAC 6 1 B+4 C52 102/500V 5 6 2 8 1 Net Weight: Head: 26.5 lbs. (12 kg) Combo: 37.5 lbs. (17 kg) 16 Limited Warranty Information This amplifier is warranted, to the original Purchaser, to be free from defects in material and workmanship for a period of five (5) years, excluding the tubes and speaker, which are warranted for ninety (90) days, from the original date of purchase. The manufacturer shall, at its option, either repair or replace the defective product if the product is returned to the original place of purchase. If any product returned is not defective within this warranty, the manufacturer shall so advise the Purchaser and thereafter shall dispose of said product in accordance with the Purchaser’s instructions and at the Purchaser’s cost. This warranty is not transferable by the Purchaser. The warranty shall not apply to wearable parts, these items include, but are not limited to, amplifier knobs, feet, and handles. The warranty shall not apply, if the product has been misused or damaged as a result of neglect, abuse, alteration, improper handling, unauthorized repair or modification, accident or causes external to the product, such as, but not limited to, excessive heat or humidity. The manufacturer’s sole and exclusive maximum liability for any claim by the Purchaser shall not exceed the wholesale value of the product. In no event shall the manufacturer be liable for any indirect, incidental, collateral, exemplary, or consequential damages of losses arising out of the Purchaser’s purchase of the product. The above limitations may not apply in some states (U.S.), international regions or countries. VHT AMPLIFICATION HAND-WIRED IN CHINA