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  • Voice Of Music (assorted 1961 - 1963)
    Voice Of Music assorted 1961 1963 Click on thumbnail for enlargement disabled for demo

    Original URL path: http://www.bassboy.com.au/getreel/site/classicamps/files/brochure/vom/vom.htm (2015-11-27)
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  • Dulci Stereo Equipment, 1958
    Dulci Stereo Equipment 1958 Click on thumbnail for enlargement disabled for demo

    Original URL path: http://www.bassboy.com.au/getreel/site/classicamps/files/brochure/dulcistr/dulci.htm (2015-11-27)
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  • Leak TL 12
    TL 12 was a logical and more cost effective development of the Type 15 The basic TL 12 circuit was evolved in 1947 initially for the purpose of driving record cutting heads The output stage utilised a pair of 6V6G KT66 tetrode valves which were connected in triode mode with cathode bias Stage one utilised a pentode voltage gain stage with the second stage consisting of a long tailed pair phase splitter and driver This configuration formed the basis for all of Leak s valve power amplifier circuits for the next 20 years Leak s reputation for high performance at reasonable cost and an extremely high standard of manufacturing was soon established The TL 12 was extremely well constructed and utilised no electrolytic capacitors in the power supply Oil filled paper capacitors were used instead these were more expensive but lasted a lot longer In January 1949 the advertised price of a TL 12 was 25 15 shillings with the matching preamplifier an additional 6 15 s Given that in 1949 the average wage was about 8 a week this was an expensive piece of gear about four weeks wages In the USA Allied Radio s 1951 catalog advertised the TL 12 for 153 70 amp only and 192 including the preamplifier The TL 12 remained in production until about 1955 Its appearance varied over the years but not the circuit Early units featured a bronze enamel finish and open frame transformers Sometime around 1952 1953 a gold finish replaced the bronze and transformers with pressed steel shrouds were introduced Some TL 12 amplifiers around this time had a mix of both types of transformers on the same chassis In 1957 the TL 12 was replaced by the TL 12 Plus physically smaller than the TL 12 and using the

    Original URL path: http://www.bassboy.com.au/getreel/classicamps/files/amps/leak/tl12/amp.htm (2015-11-27)
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  • Rogers Cadet III stereo integrated amplifier
    sold as an integrated unit with the control unit and power amplifier lower two pictures housed inside an Australian walnut case The front panel of the control unit featured a silver and black two tone facia The upper three knobs from left to right were balance bass and treble the tone controls were of the Baxandall type Next to these were two low pass filter switches Beneath these controls was a row of push button selector switches for stereo mono disc radio and tape inputs Next to these was a 5 pin DIN tape socket and to the right of this was the master volume on off control and power light The basic power amplifier circuit hadn t changed much from the Cadet Mk II but more output was obtained by the use of a voltage doubling silicon rectifier circuit in the power supply and improved output transformers The preamplifier was where most of the circuit innovations were to be found By this time the superior magnetic cartridges were gaining favour over the inferior ceramic ones What had once been optional add on equalised magnetic cartridge preamps were now part of Roger s preamplifier This was also one of the

    Original URL path: http://www.bassboy.com.au/getreel/classicamps/files/amps/rogers/cadet3/amp.htm (2015-11-27)
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  • 6L6 / 6L6GC
    by the Radio Corporation of America RCA in July 1936 Philips had already developed and patented power pentode designs most notably the EL34 and the more efficient power pentodes were quickly replacing power triodes RCA wanted a slice of the action but rather than copy Philip s design they purchased the rights for the kinkless tetrode or Beam tetrode from British firm Marconi Osram Valve MOV through a design share agreement although RCA s own engineers were developing similar designs at that time Because MOV s engineers did not feel the kinkless tetrode could be successfully mass produced they were happy to license the design to RCA a poor business decision on MOV s part RCA subsequently had enormous success with the 6L6 which replaced the use of power triodes in public address amplifiers almost overnight MOV bounced back a year later when they introduced their own version the KT66 which was used in the extremely popular QUAD II power amplifier L R early metal type early 60 s 6L6GC current version RCA s first 6L6 had a metal canister shell rather than glass most of the early octal based tubes of the era were being manufactured with metal shells and many radio users were nervous about being injured by glass from a broken tube Later versions including the 6L6G 6L6GA 6L6GB 5881 5932 and the final version 6L6GC had glass envelopes which facilitated radiation cooling of the anode The original metal version was rated for 19 watts dissipation while the 6L6GC was capable of 30 watts The list of variations of the 6L6 design quite extensive Early variations included transmitting tubes such as the 807 1937 and the giant 813 1938 the smaller 6V6 1937 not to mention the many KT versions marketed in Europe One of the largest

    Original URL path: http://www.bassboy.com.au/getreel/classicamps/files/tubedata/6l6/main.htm (2015-11-27)
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  • Leak TL 12
    c s Frequency response 0 5dB 20 20 000 c s Loudspeaker impedances any impedance between 3 and 20 output transformer adjustable for 16 8 4 Hum and noise 82 Db 3dB below 12 watts with a source impedance of 25K Input sensitivity an input of 125mV at 1 000 c s gives 12 watts output Input impedance 1M plus approximately 5 mmfd Damping factor 25 measured at 1 000

    Original URL path: http://www.bassboy.com.au/getreel/site/classicamps/files/amps/leak/tl12/specs.htm (2015-11-27)
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  • Leak TL 12
    Leak TL 12 Circuit diagram Click for enlargement power amplifier preamplifier

    Original URL path: http://www.bassboy.com.au/getreel/site/classicamps/files/amps/leak/tl12/circuit.htm (2015-11-27)
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  • Leak TL 12
    15 ohms 20 ohms condition TOTAL HARMONIC DISTORTION for 10 WATTS OUTPUT 0 037 at 1 000 c s 0 0003 ratio to fundamental 0 1 at 60 c s 0 001 ratio to fundamental 2nd and 3rd harmonics predominated and were approximately equal in magnitude HUM AND NOISE 80db referred to 10 watts SENSITIVITY 148mV r m s input gave 12 watts output at 1 000 c s LOAD

    Original URL path: http://www.bassboy.com.au/getreel/site/classicamps/files/amps/leak/tl12/test.htm (2015-11-27)
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