One of the finest amplifiers available for hobbyists to build in the early 1960s was the mullard 5 10 ultralinear valve unit. The mullard book presents all of the graphs and of the measurements for best power levels at the lowest distortion. Chassis only or for building in dimensions whd 10 x 6. These amplifiers were the product of their applications lab and the first design was the mullard 5 10 from 1954. Also superb in audiophile equipment, tube mics, mic preamps and studio equipment. Cdrom contents 20062008 all of the amplifiers featured on the classic amps cdrom have pictures, descriptions and specifications. Jun 30, 2016 they calculated a cumulative success rate of 11. Diy audio books and manuals speakers, vacuum tubes. The ike, or eiclone pronounced i clone uses the 12ax7 as the voltage gain stage tube, as did the classis eico hf87 and hf89. First published in 1959 and then reprinted several times it contained a number of designs by mullard engineers for high quality audio amplifiers, which were to be used by amateur constructors as well as by manufacturers as the basis for many.
If you get stuck in repairing a defective appliance download this repair information for help. Manufactured in mullards mitchum factory in the early 1980s. Although the material dates to the 50s, this information is as good today as it was back then, when tubes were the only act in town and the best audio engineers were still working with vacuum tubes. Service manuals, schematics, eproms for electrical technicians. While this is an old book it is detailed and easy to follow. Mullard technical handbook book 1 part 5 microwave transistors, diodes and subassemblies 1982 mullard ltd. Try one of these in your phase inverter or reverb driver socket only if your amp calls for 12at7s in these positions in your fender amp for a real upgrade in tone. The circuit was first published in practical wireless magazine the amplifier featured five valves and an output of. The dynamull driver board is a classic valve design adaption of the mullard 520 circuit for the dynaco st70 with some modernization. One of the finest amplifiers available for hobbyists to build in the early 1960s was the mullard 510 ultralinear valve unit. View and download bush tr servicing instructions online. Mullard book 3 part 5 components loudspeakers television.
Manufactured in mullard s mitchum factory in the early 1980s. It is the source of the famed 510 and 520 mullard amplifiers. Mar 23, 2011 i may eventually do it anyway, but for now the jan ge 5751 is working wonders coupled with the mullard cv402412at7 in my phase inverter. Click here to download the pdf 190kb twin triode phasesplitting amplifier clare. The design closely resembles the eico hfseries which used a modified mullard 520 circuit. I also have the ecl86 pamphlet 4094 from 1962 and the ecl86 designs are taken from this.
The links lead to an illustration of the front page of the issue and a download in pdf format. The mullard 520 design was fully optimized by the designers at mullard and it is a published fact. The circuit design of the mullard 5 10, together with the recommended partridge output transformers, was famous for its unique sound reproduction and many variations of this amplifier including mullard s own 20 watt version, the mullard 5 20 using the el34 were in widespread use until the end of the valve era. The lancet vol 395, issue 10232, pages 122914 1824. It also reduces any deviation from linear frequency response by a factor 10, all compared to the performance without nfb. Order jj ecc802s 12au7 gold vacuum tubes online, in stock and ready to ship. Looking at getting a pair of nos 12ax7s for v1 and v2 of my dr z maz 18 nr head. Mullard mbs23 service manual download, schematics, eeprom. It is the source of the famed 5 10 and 5 20 mullard amplifiers. At my age, nostalgia or even, possibly, neuralgia would involve a wind up gramophone. Ive read a lot about the 12at7s and i think what makes them so great in a pi is that they have less mu gain but they have nearly 5 times the transconductance and are passing way more current into the. These started out as being published in their technical bulletins and were later collected into book form. It is a fantastic tube with clean sonics, low noise.
This retube set for the marshall el84 2020 tube amplifier consists of the very best vacuum tubes we have to offer. Warranty information and return policy warranty period. American industrial titan rca offered schematics for a variety of tubeaudio equipment in the back pages of their many receiving tube manuals. Here is an example of a mullard blackburn, uk factory date code. Mullard type with pentode voltage amplifier 12sj7 and cathodecoupled phase inverter 12sn7 rated power output 8 ohms. Seems that mullard and telefunken are the big names in nos tubes so since i. Mullard discussion in amps and cabs started by jwri9790, sep 11, 2011.
Click here to download the pdf 560kb selfsplit, pushpull circuit analysis amose. Mullard circuits for audio amplifiers is a famous book by the technical services department of mullard ltd, a british valve manufacturing company. You can view 29 of the 104 pages in the full issue and the advertisments. Diy audio books and manuals speakers, vacuum tubes, electronics. Omq for load for 3750 loadw or 1501 rio ril r12 r rv14 r15 390kq ikq 150q 22kq 39k q 56003 ikq h. View and download phaedrus audio phab user manual online. Probably the most renowned 5ar4 rectifier tube, the mullard really makes a difference in your hifi or guitar amp sound. The b is blackburn, uk mullard factory, the 2 is 1962, the j is october, and the 5 is the 5th week of the month. Its products range from all types of valves and electron tubes for radio, television, industry, and research to a. The mullard 510 was a circuit for a valve amplifier designed by the british valve company, mullard in 1954 at the mullard applications research laboratory arl in mitcham surrey uk, part of the new road factory complex, to take advantage of their particular products. The dynamull driver board is a classic valve design adaption of the mullard 5 20 circuit for the dynaco st70 with some modernization. Mullard technical handbook book 1 part 5 microwave. Two main differences are the choice of input tube and the constant current source ccs in the tail of the phase inverter.
The mullard tube circuits for audio amplifiers book was first published in 1959 by mullard, britains premier vacuum tube manufacturer. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The following is a list of the main technical articles to be found in each issue. These are brand newnos but were aquired in bulk so supplied in white boxes. It covers classic mullard circuits like the 520 and 510 power amplifiers, which defined high fidelity in the 50s and whose designs are still as good as gold today. In addition much of the equipment features one or more of the following items. This gain stage dccouples to a 6sn7 longtail pair phase splitter driving a pair of pushpull el34 tubes.
If you are interested in mullard tubes, most notable being the ef86, el84, and el34 then this is the book for you. First published in 1959 and then reprinted several times it contained a number of designs by mullard engineers for high quality audio amplifiers, which were to be used by amateur constructors as well as by manufacturers as the. The design closely resembles the eico hfseries which used a modified mullard 5 20 circuit. March 1982 mullard masterslice, cross over the sites and their number may be limited by the cells in the sites. Mullard, a prominent british maker of vacuum tubes, similarly published a book entitled mullard tube circuits for audio amplifiers h. Mullard gz34 5ar4 nos f32 7 notch version nos vacuum tubes. Mullard circuits for audio amplifiers by james perrett wed dec 19, 2018 9. Resistors mains r8 ez80 fuse r output cl r5 ef86 2000 1 00 m.
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