The mullard 510 ten watt valve amplifier october 2014. This is a list of european mullardphilips vacuum tubes and their american equivalents. Fundamentals of amplification this chapter deals with the design and analysis of the basic triode gain stage, which is the main building block of a valve preamp. In the foreground, the 10w and 40w transistors amplifier may be. This book has a special meaning to me because the first amplifier i ever built, as a young teen in the 60s, was a mullard 520. Mullard, a prominent british maker of vacuum tubes, similarly published a book entitled mullard tube circuits for audio amplifiers h. Mullard circuits for audio amplifiers is a famous book by the technical services department of mullard ltd, a british valve manufacturing company. These started out as being published in their technical bulletins and were later collected into book form. Mullard tube circuits for audio amplifiers code 2005. Mullard circuits for audio amplifiers wave listener and building my own one valve receiver radio luxembourg on metres and horace batchelors adverts. An ef8 variant of the tube is known as for the ef86 under normal conditions, i. The reference numbers are for the latest reprints of the publications.
In these circumstances, the overload point of the amplifier is reduced from or 14 w to approximately 12 w. After some time, i said to him that if he would fulfil my wishes, i would supply him with a paper concerning the matter and a practical construction that could be built by amateurs, resulting in a. Mullard circuits for audio amplifiers primary windings. The values of the smoothing resistor r17 given in the circuit diagram are suitable for use with the mullard designs for two and three valve pre amplifiers. Jan 01, 2018 this is a quick tutorial with our service technician taking you through the circuit of the mullard 33 valve amplifier, a british vintage classic from the late 50s, early 60s. Stern mullard 2 valve pre amplifier control unit mkii. Service guide, the whole of the text has been carefully revised to include data on new valves. Hafler and keroes valve amp schematic from audio engineering 1951 in searchable and scalable pdf. Mullard circuits for audio amplifiers the valve museum. Here is chapter 3 of the mullard hifi book in which the circuit is published detailing the design criteria.
A close up of the mains and ht side of the amplifier. In preparing the second edition of the mullard valve and. Special quality variants may have the letters sq appended, or the device description letters may be swapped with the numerals e. Mullard tube circuits for audio amplifierspower amplifiers and pre amplifiers for monaural and stereophonic reproduction from microphone, radio, tape and. These range from a 3w singleended amp to a 20w pushpull power. Valve amplifier schematic from 1947 wireless world article by d. This valve was specially designed by mullard for the. Jan 07, 2018 this is a quick tutorial with our service technician taking you through the circuit of the mullard 510 valve amplifier, a british vintage classic from the late 50s, early 60s. Mullard in the mid fifties and show distortion versus output power for two. Mullard technical handbook book 2 part 2 valves nov 1973 electrooptic devices, radiation detectors. Figure 1 shows several pushpull tube amplifiers only the power tubes and the output transformers primary winding. 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. A push pull valve amplifier almost invariably follows one of the two schemes shown in block. It contains simple, clear descriptions of the theory of valve amplification and the design of circuits, together with practical stepbystep instructions for building a number of excellent amplifiers.
Phone 718 9378300 toll free 800 6335477 fax 718 9379222. The v60 was one of the last valve amplifiers from bofa. The most common triode type found in guitar amps is the ecc83 12ax7, while the ecc81 12at7, ecc82 12au7 and 12ay7 occasionally make an appearance. I always obtain a certificate of posting which i will send to you in the event that an item goes missing, so that you can follow up. The drive circuitry of the control grids is not shown i assume perfect. Goldthorp and tollow of mullard head office testing the popular mullard range of audio amplifiers. For the rest, this is a catalogue of mullard radio valves and electron tubes, and it contains descriptive details of every type in the current manufacturing programme.
Stern mullard amplifiers 510 and 33 advertising leaflet. The ht supply for pre amplifiers should be taken from c14. Mullard magic is run by a long term collector of vintage electronics, classic cameras, classic watches, automobilia and classic cars who has extended his passion to aid other collectors worldwide to obtain a wide range of scarce and desirable vintage radios, vintage valves or tubes, military radios, vintage hifi audio items as well as other. Electroharmonix 5501 2nd street long island city, ny 11101. If you have any stern equipment you wish to dispose of then. Mullard magic stocks vintage radio, military radio like r1155, t1154, ws19, military spare parts, valves, tubes by gec brimar mullard ecc83 kt66 ecc32 u52, radio components early wireless, vintage radio, domestic vintage radio, old technology of all kinds. I shall not give you a step by step building manual, only some guidelines. In the foreground, the 10w and 40w transistors amplifier may be seen. Output pentodeoutput pentode rated for 25w anode dissipation,ntended for use in a. Mullard circuits for audio amplifiers by james perrett wed dec 19, 2018 9. Mullard reference manual of transistor circuits mullard ltd 1st ed 1960 acrobat 7 pdf 11. Some of this material is general and applies as much to hifi circuits as to guitar amps, but some of it is very. Mullard e88cc double triode valve tube guitar amps.
Schematic from 1949 wireless world article new version by d. The mullard 3 3 amplifier in the early 1950s mullard produced a number of amplifier designs to promote their valves. The mullard 510 ten watt valve amplifier the messui place. The consistent use of the same type of valves is partly historical, since many modern amplifiers are derivations or merely copies. I also have the ecl86 pamphlet 4094 from 1962 and the ecl86 designs are taken from this. Mullard tube circuits for audio amplifiers code 2005 the first notable contribution of milliard design engineers to the specialist world of highquality sound reproduction was the now famous fiveten amplifier circuit which was introduced in the summer of 1954. Up for sale is a mullard tube circuits for audio amplifier book. For musicians use and to promote sag, the two output diodes may be replaced with a ez80 or ez81 rectifier valve, although you should also provide it with its own extra vt1036 heater transformer to avoid a large voltage difference between the cathode and heater i. The vseries from the 1950s included a small el84 pp called v15 and a high power version model v120.
Mullard tube circuits for audio amplifier book free shipping. Audiophiles, guitarists and general hobbyists alike will find this book an invaluable source of detailed information on transformers, rectifiers, smoothing, highvoltage series and shunt. The values of the smoothing resistor r17 given in the circuit diagram are suitable for use with the mullard designs for two and three valve preamplifiers. Before the advent of the ef86 the mullard valve of choice for preamplifier stages was the ef37a mullard describe the ef86 as a low noise pentode intended for use as a rc coupled datasheett voltage amplifier, particularly in the early stages of high gain audio amplifiers, microphone preamplifiers and magnetic tape recorders.
Vinglg, jql i mullard i vsa my3275 7573 my3275 power triode directly heated triode rated for a, modulators. Power triode power triode valve driver amplifier mullard 425 x363 mullard el37 i500 triode push. B amplifier or modulator driven by two el34 in directcoupled cathode follower circuit see circuit, a. Most postwar european thermionic valve vacuum tube manufacturers have used the mullardphilips tube designation naming scheme special quality variants may have the letters sq appended, or the device description letters may be swapped with the numerals e. Designing power supplies for valve amplifiers is a unique guide to the operation and practical design of linear power supplies, especially for valve equipment. The most important of these to the designer of new equipment are indicated by heavy print in the valve data section.
Brown, was present and took the opportunity of addressing the guests. The designs are quite different from rcas, as mullard promoted different tubes. Electroharmonix is a leading manufacturer of guitar effects pedals, vacuum tubes, and electronic and pro audio parts and supplies. One of the finest amplifiers available for hobbyists to build in the early 1960s was the mullard 510 ultralinear valve unit.
Advice on the use and applications of mullard valves and electron tubes is freely available to designers and manufacturers of equipment, and to research workers. Mullard tube circuits for audio amplifiers code 2005 hifi. Mullard tube circuits for audio amplifierspower amplifiers and preamplifiers for monaural and stereophonic reproduction from. 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.
Before the advent of the ef86 the mullard valve of choice for preamplifier stages was the ef37a mullard describe the ef86 as a low noise pentode intended for use as a rc coupled af voltage amplifier, particularly in the early stages of high gain audio amplifiers, microphone preamplifiers and magnetic tape recorders. This is the original radio constructors project to build the 3 valve 3 watt amplifier using ef86 el84 and ez80 valves. These amplifiers were the product of their applications lab and the first design was the mullard 510 from 1954. Note that while this valve can be classed like an ecc83 12ax7. It has 20% ulatra linear taps and matches the 6k6 anodeanode impedance with 4, 8 or 16 ohms. Mullard circuits for audio amplifiers by james perrett. Stern mullard 3 valve 3 watt amplifier 33 stern mullard 510 amplifier and remote control unit.
Most postwar european thermionic valve vacuum tube manufacturers have used the mullardphilips tube designation naming scheme. The last decade has seen a growing interest in valve amplifiers, which is not only due to nostalgia but more to the fact that a good valve amplifier sounds different from most solid state. Mullard rearranged the part number from the expected ecc88 to e88cc to highlight that it is designed as a long service valve. These range from a 3w singleended amp to a 20w pushpull power amp, including the outstanding mullard 510 design. 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. This is a quick tutorial with our service technician taking you through the circuit of the mullard 33 valve amplifier, a british vintage classic from the late 50s, early 60s. Stern 10 plus 10 stereo power amplifier and passive control unit. Jun 25, 2018 mullard circuits for audio amplifiers the prototype output transformer is designed for the distributed load configuration. This is a quick tutorial with our service technician taking you through the circuit of the mullard 510 valve amplifier, a british vintage classic from the late 50s, early 60s.
Pdf btw162dv btw162idvr m2778 m871523rst 10a fast gate turnoff thyristor m2739 m2778 thyristor equivalent mullard thyristor r mullard diode iec4 gt250 v125. Details of the mullard 520 more information on the mullard 520 amplifier and circuitry can be found on this site. Mullard tube circuits for audio amplifier book free. The e88cc is not pin compatible and not designed to replace an ecc8312ax7.
Mullard valve measurement and application laboratory. The circuit was first published in practical wireless magazine the amplifier featured five valves and an output of 10 watts. Mullard, such as technical data, publi cations, films, displays, etc. Construction and assembly the chassis for the 10 w amplifier in which tone and volume controls are incorporated is made from three separate pieces of 16. In view of the enormous popularity of the mullard 510 valve amplifier, it appeared that a 10watt output would be adequate for normal use. The anodes are connected to the primary winding, the cathodes to ground circuits 1, 2, and 3, and the middle of the primary to the highvoltage supply. Ul41 mullard philips uk holland audio output pentode valve tubes. Building the mullard 510 amplifier primary windings.
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