Ultra 4B SE Special Edition. Stereo Phono/Line Preamplifier
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1 Modular Series Ultra B SE Special Edition Stereo Phono/Line Preamplifier User s Manual Phono Line Line Balance Volume Mapletree Audio Design Ultra B SE Stereo Preamplifier Rev. Feb. / Mapletree Audio Design Lloyd Peppard R. R., Seeley's Bay, Ontario, Canada, K0H N0 () -0 info@mapletreeaudio.com Copyright Lloyd Peppard Specifications are subject to change without notice-
2 Introduction _ The Mapletree Audio Design Ultra B SE Stereo Phono/Line Preamplifier offers the audiophile a number of desirable features:?? Compact chassis layout for use with separate power supply for low noise.?? Exclusive use of NOS octal tubes, known for low distortion and musicality.?? Switchable for use with SNGT or SNGT tubes.?? Precise RIAA equalization (±0. db) using non-interacting passive and active filters.?? High input impedance and low output impedance.?? Parallel output jacks for bi-amp or headphone amplifier applications.?? Phono gain of db suitable for all moving magnet (MM) and high-output moving coil (MC) phono cartridges.?? Audio grade polypropylene and polystyrene film capacitors in signal path. Power Supply Connections The Mapletree Audio Design PS power supply provides + VDC (regulated) heater supply voltage and +00 VDC B+ plate supply voltage at a current of ma (see specifications). It utilizes a slow start cathode type rectifier tube (XGT) in conjunction with low-noise ultra high-speed diodes to achieve all the advantages of tube rectification (low noise, soft startup) with the high efficiency of a bridge rectifier topology. The separate power supply eliminates induced hum originating from power supply circuitry and components. The power connections to the preamplifier chassis are made through a special -conductor power cord that plugs into jacks located on the rear panels of the power supply and preamplifier chassis. CAUTION: Do not operate the power supply when it is not connected to the preamp. Damage of components may result. Once the interconnecting power cord is securely attached between the two chassis and the line cord is plugged in, the power supply can be turned on. The pilot lamp on the power supply chassis indicates that the unit is on. It takes about 0 seconds for the tubes to reach
3 operating temperature ready for use. During operation, is it normal for the power supply chassis to become warm to the touch. The power supply is protected by a A/0 V fast-acting fuse, which can be accessed by removing the bottom chassis cover after the unit has been unplugged for at least 0 sec. Under normal conditions, it should not be necessary to replace the fuse. If power fails to come on, you can check the fuse and replace with a spare if necessary. If the fuse blows a second time, you should not try to operate the unit. Contact Mapletree Audio Design for information regarding service. Signal I/O Connections SN SN Out G n d P h o n o L i n e L R The signal input/output jacks are located on the rear panel of the preamplifier chassis. RCA jacks are provided for phono input, two line inputs, and two line outputs. Left channel jacks are at the top and right channel jacks are at the bottom. A binding post is provided for phono ground. The phono input resistance is k?? which matches standard MM phono cartridge loading requirements. The input capacitance is approximately 0 pf. The line input impedance is 0 k???which provides minimal loading of any line source such as CD/DVD player, tape deck, tuner, or PC sound card. The line output impedance is less than 00?? which is suitable for connection to a power amplifier through cables up to 0 ft in length. The ground wire from the turntable should be connected to the ground binding post to minimize hum pickup. The heater voltage switch located next to the power input jack allows you to accommodate either SNGT (supplied) or SNGT tubes in your Ultra A. Note that the switch does not affect the heater voltage for the SC tubes. While it will do no damage to switch to SN position with SN tubes installed, operation in the SN position with SN tubes may damage the tubes.
4 Front Panel Controls Phono Line Line Balance Volume Mapletree Audio Design Ultra B SE Stereo Preamplifier The front panel controls are (left to right) the -position Source selector switch (Phono- Line-Line), the Balance control, and the Volume control, which adjusts the gain of both channels simultaneously. If you find that you hear pops from your speakers when switching between sources, turn down the volume control before switching. Tubes SC (L) SC (R) SNGT (L) SNGT (R)
5 Vacuum tube socket locations are shown in the diagram on p.. The SCs are toward the rear of the chassis. The tubes supplied are new-old stock (NOS) and have been pretested. A burn-in period of several hours may be needed to achieve the best sonic performance. Tube life should be thousands of hours. Aging tubes may result in a reduced gain in one or both channels or an increase in noise levels. Infrequently, a heater may burn out which is indicated by total loss of sound. Replacement tubes can be obtained from several suppliers in the U. S. and Canada. Mapletree Audio Design will attempt to provide replacement tubes to customers at cost plus shipping. Some listeners enjoy trying different brands and variants of tubes. The heater voltage selector switch permits the use of SNGT (or the 9 special red version) tubes of NOS or current manufacture. The highly regarded SXGT is equivalent to the SNGT. Warranty Assembled components are warranted for years to the original purchaser for failure of parts (excluding tubes) and workmanship. Tubes are warranted for 90 days exclusive of shipping cost. Service, including parts and labor (but excluding shipping), is free within the warranty period.
6 MAD Ultra B SE Phono/Line Preamplifier Copyright Lloyd Peppard 00-0 Rev. Jan. / L. Line inputs L. Phono input Ja chassis Ja Ja R0a K % Ra.K % Ca 0.0 % Ra K % Ra K % Ca 0./00 Ra.M % C Va SC Ra K % Ra K % Ra.M % Ra Ca K % 0 pf % + V Ra 00K % Ca 0./00 R9a K % SWa Source Ca 0.00 % Da red LED B Ra.K % Ca /00 Va SNGT Pa 00K Volume P Balance 00K Ca 0./00 Ra K % A C9a /00 Ra Ra M % K % Ra 0K % L. outputs Ja Ja J Gnd. Ground Bus R. Line inputs R. Phono input Jb Jb Jb R0b K % Rb.K % Rb K % Cb 0.0 % Rb K % + V Rb.M % Ca 0./00 Vb SC Rb K % -0. V Rb -0. V K % C Rb.M % + V Rb Cb K % 0 pf % + V Rb 00K % Cb 0./00 R9b K % Cb 0.00 % SWb Source + V Db red LED B + V Rb.K % Cb /00 Pb 00K Volume Vb SNGT Cb 0./00 Rb K % A +00 V + V C9b /00 Rb K % Rb M % +. V Rb 0K % R. outputs Jb Jb C + V B + V +00 V A R K W % R9.K W % + C 00/00 C 00/00 + _ VDC + SCs J Power In V V SW Heater Voltage SNs
7 Parts List Reference No. Ca,b Ca,b, Ca,b, Ca,b Ca,b Ca,b Ca,b, C9a,b Ca,b, Ca,b Da,b Ja,b Ja,b J J Pa,b Pa,b Ra,b, Ra,b Ra,b, Ra,b Ra,b Ra,b, R9a,b Ra,b, Ra,b Ra,b Ra,b Ra,b Ra,b Ra,b R R9 R0a,b, Ra,b SW SW Va,b Va,b Description 0.0uF/0V % polystyrene capacitor 0.uF/00 V polypropylene film capacitor 0pF/0V.% polystyrene capacitor 0.00uF/00 V % polypropylene capacitor uf/00 V polypropylene film capacitor 00uF/00V electrolytic capacitor 0 ma red LED RCA gold plated phono jack -pin chassis jack (power in) Ground binding post 00K dual audio taper potentiometer 00K linear potentiometer.k 0.W % metal film resistor.m W 0% carbon film resistor K 0.W % metal film resistor K 0.W % metal film resistor K 0.W % metal film resistor 00K 0.W % metal film resistor K 0.W % metal film resistor K 0.W % metal film resistor 0K 0.W % metal film resistor M 0.W % metal film resistor K W % metal oxide resistor.k W % metal oxide resistor K 0.W % metal film resistor position, -pole rotary switch ( poles used) DPDT heater voltage selector switch SC tube SNGT tube
8 Circuit Operation Referring to the schematic diagram, both channels are identical. The following description refers to either channel unless otherwise noted. The phono input signal is applied to input jack J, loaded by resistor R, then capacitor coupled to the grid of the first section of the SC which is configured as a common-cathode voltage amplifier. Capacitor C sets the low frequency breakpoint in the RIAA equalization curve at 0 Hz. The negative grid bias is obtained through the grid resistor R. The output from this stage is capacitor coupled through C to the second stage which uses the second section of the SC also configured as a common-cathode voltage amplifier. The feedback network consisting of R, R, and C implements the turnover frequency of the RIAA curve at 00 Hz. Bias is again obtained through the leakage grid current flowing through the. M? resistor R. The signal is then capacitor coupled through C to the phono terminal of the source selector switch (SW). The passive network comprised of R and C implements the roll-off frequency of the RIAA curve at 0 Hz. The selector switch is used to steer either the amplified phono signal or one of two line input signals (jacks J and J) to the third stage, which utilizes the first section of the SNGT in a common-cathode voltage amplifier configuration giving a gain of around db. This stage is biased by a lightemitting diode (LED) which provides the required dc bias voltage while presenting a low resistance to signals. This eliminates the necessity of an electrolytic cathode resistor bypass capacitor. The output of this stage is capacitor coupled through C to the volume control potentiometer P and to the balance control potentiometer P. The wiper of the level control is capacitor coupled through C to the grid of the output stage, which employs the second section of the SNGT configured as a cathode-follower. This stage has a voltage gain of less than unity but provides a low output impedance suitable for driving cable capacitance without loss of high frequencies. Grid bias is obtained by resistors R and R while R establishes the plate voltage and current to provide maximum output voltage swing. The output voltage is taken from the cathode of the output stage, capacitor coupled to the output jacks J and J through capacitor C9.
9 MAD Ultra B Specifications Phono Section (00 k? load) Max. RIAA error: 0. db 0 0 khz Maximum Gain: 0 db Noise: less than mv for gain of db; less than mv for gain of 0 db Input resistance at khz: k?? Line Section (00 k? load) Frequency response ( V output, 00K load): 0 Hz 0 khz 0. db (any volume control setting) Max. output voltage (00K load): V rms Gain: db Channel balance: ±0. db Hum and noise: less than 0? V at full gain, input shorted Input impedance ( khz): k? Output impedance ( khz): 0??? Power requirements: + A, +0-0 ma (ground is common to both supplies) 9
10 Power Supply Parts List Reference No. Description BR A/00V diode bridge Ca,b Dual 0uF-0uF/00V electrolytic capacitor C 0000uF/V electrolytic capacitor D N00 diode D 0 ma LED D, D MUR0 high speed diode (00 V) FU ½ A/0 V fast action fuse J -pin chassis jack J IEC ac line receptacle IC, IC voltage regulator R.K W % wire-wound resistor R 0K W % metal film resistor R.K W % carbon film resistor SW SPST power switch (0 V rated) TR 0 / ma power transformer TR /. A filament transformer TR. /0.9 A filament transformer V XGT rectifier tube Mapletree Audio Design Preamplifier Power Supply PS Copyright Lloyd Peppard 00- Rev. Feb. / L N FU 0.A/0V G Chassis SW Power J 0AC 0 Hz TR ma D, D MUR0 V XGT R.K W + Ca 0/00 + Cb 0/00 R 0K/W B+ GND J Power Out Rear View TR D N00 R.K. A BR A + IC + C 0000/ LM D LED TR 0.9 A X LM IC D IC Mounting tab connected to pin insulated from chassis 0
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