The ULTRAVOX MOD. DONATELLO 16C is a portable B/W television with 16 inches screen and completely based on tubes technology.
Tuning is performed with VHF and UHF channel selectors on the right side, and the set doesn't weight much like comparing to others sets like the weight of a PHILIPS portable models from the same era of time.
The B/W Tubes Television set was powered with a External Voltage stabiliser unit (portable metal box) which relates to voltage regulators of the type employed to supply alternating current and a constant voltage to a load circuit from a source in which the line voltage varies. Conventional AC-operated television receivers exhibit several undesirable performance attributes. For example, under low-line voltage conditions such as those encountered during peak load periods or temporary power brown-outs imposed during times of power shortage, picture shrinkage and defocusing are encountered and under extreme brown-out conditions the receiver loses synchronization with a resultant total loss of picture intelligibility.
On the other hand, abnormally high-line voltage conditions are sometimes encountered, and this can lead to excessive high voltage and X-ray generation. In addition, either abnormally high steady state line voltage conditions or high voltage transients such as those encountered during electrical storms or during power line switching operations may subject the active devices and other components of the receiver to over-voltage stresses which can lead to excessive component failure.
It is a principal object of the present invention to provide a new and improved AC-operated television receiver having greatly improved performance characteristics in the presence of fluctuating power supply voltages.
A more specific object of the invention is to provide an AC-operated television receiver affording substantially undegraded performance under even extremely low-line voltage conditions without excessive high voltage and X-ray generation under even extremely high-line voltage conditions.
Still another and extremely important object of the invention is to provide a new and improved AC-operated television receiver having greatly improved reliability against component failure. Such regulators are frequently provided employing saturable core reactors and condensers connected in circuit... in such manner as to provide a plurality of variable voltage vectors which vary in different senses, as the line voltage varies, but which add vectorially in such manner that their vector sum remains substantially constant upon variations in line voltage, for providing automatic voltage stabilization of single or multiphase A. C. circuits where the supply voltage and frequency are subject to variation above and below normal value and where the load is subject to variation between normal limits.
is automatically effected by the provision of an inductive pilot control device which is adapted to provide two excitation supply voltages for producing excitation or satuation of two magnetic circuits of a reversible booster transformer unit or units and diversion of flux from one magnetic circuit to the other, the booster unit being energized by primary windings from the A. C. supplysystem and being provided with a secondary winding or windings connected between the supply system and the corresponding inain or distribution circuit and in series therewith, through which a corrective boost voltage is
imrorjiiced into the circuit under the inﬂuence of the pilot control device, of an amount equal to that of the supply voltage fluctuation which initiated it and appropriate in polarity and direction for restoring the voltage to normal value and providing automatic stabilization of the circuit voltage against supply voltages which fluctuate above and below normal value.
The pilot control device which may be employed singly or may comprise three units or their equivalent when applied to multiphase supply systems comprises a pair of closed magnetic circuits or cores constructed of strip wound magnetic material or stacked laminations, the two
circuits forming a pair being constructed of materials possessing dis~similar magnetic characteristics when jointly energized by identical windings in series or by a collective primary winding, the said magnetic circuits being suitably proportioned to provide equal ﬂuxes when ener-
gized at normal voltage.
The pilot control device is provided with a main and an auxiliary secondary winding or group of windings, the main secondary winding or windings being adapted to provide a voltage representing the difference in the ﬂuxes of the two circuits to which it is jointly associated, while
the auxiliary secondary winding embraces only one circuit, preferably that subject to the least amount of ﬂux variation. Either of the windings consists of two equal sections or in effect a double winding with a center tapping to which one end of the single winding is connected.
The voltage in the single secondary winding of the pilot device becomes directionally additive to that in one half of the tapped secondary winding and substractive in respect to that in the other half. When the supply voltage is normal the voltage provided by the single secondary winding is zero, since there is no difference of ﬂux in the two magnetic circuits, and the two excitation voltages
produced in the halves of the other secondary winding are equal and when connected to the two excitation windings of the booster units, do not produce any diversion of flux between the two circuits or sets of circuits in the magnetic system of the booster transformer unit become equal, and since the series winding on the booster unit is arranged to provide a voltage due to the difference of
the ﬂuxes in its two magnetic circuits or sets of magnetic circuits, no corrective voltage is introduced into the main circuit by the booster. If, however, the supply voltage varies from normal the pilot control device provides a voltage across the one secondary winding due to the difference in the ﬂuxes of the two dis-similar magnetic circuits of which it is comprised, which voltage is combined with thosc in the halves of the other secondary winding to provide two excitation voltages which vary complementarily to each other as the supply voltage ﬂuotuates, and cause a transference of ﬂux between the two
circuits or groups of circuits in the booster unit and automatically provide a corrective boost voltage in the main circuit in which the series winding of the booster transformer is includcd of a value equal to that of the variation in supply voltage which initiated it.
The pilot device may be arranged in various ways, forboth single phase and multiphase operation, as exemplified by the constructions hereinafter more fully described.Similarly, numerous arrangements of the booster transformer unit are possible, some of which are hereinafter described in detail. The booster transformer unit embodies thc principles of the inductive devices described in my co-pending Application No. 411,189, ﬁled February 18, 1954.
As an alternative to the provision of an auxiliary secondary winding on the pilot control device this may be
replaced by an independent or external source of supply,which may be either subject to or independent of supply voltage variation, provided such supply may be arranged with a center tapping if required.
Feed-back arrangements may be employed for providing compensation against voltage drop due to the effects of load in various ways. These are preferably providedon the booster transformer unit and may comprise a current transformer in one or more lines of the main circuit,
the secondary output of the transformer being rectified and arranged to energize an additional excitation winding on the booster transformer unit which in clfect increases the amount of the corrective boost voltage as the load increases.
ULTRAVOX S.r.l. RADIO TELEVISIONE — Milano,
Founded in Milan in 1948 under the name Ultravox by brothers Sergio e Cino Stanghi, Initially devoted to the production of radios. In 1959 the production was moved to a plant in Caronno Pertusella in the provinces of Varese, A Few years later, was the company's Also Transferred to Headquarters, Which Was Transformed into Ultravox Group.Later in the production of Specialized Televisions, In Which sector to the mark won and Ultravox Became famous , with the creation of a special television Completely portable transistors with built-in FM radio tuner, the model with 6 inches of COLIBRI' screen in 1969, designed by John Offredi designers.In general, the models Ultravox distinguished than others, for the design, very original and futuristic, like the Beetle turntable of 1970, created always by Offredi. There were many models of televisions manufactured with built-in turntable.
In the eighties, the Company, was affected by a crisis That Began in the electronics market in financial Difficulties, and for this reason in 1982 was admitted into the list of Companies Within The REL, a public company for the consolidation of Companies electronic form .
In 1988 together with REL Gained Control of the Emerson of Florence, a manufacturer of Televisions.
The factory was started in Siena was reactivated and the production of TVs and VCRs with Ultravox and Emerson brands. In the same year Ultravox launches on market the new version of Radio-TV model Colibri With 6-inch color CRT display and AM / FM tuner.
The unit participated in the selection of the Golden Compass Award of 1989. In the nineties, the company was Overwhelmed by a new crisis, which effectively was more severe than That hit in the decade before. In 1993 he was forced to close and then Went into bankruptcy. To Overcome this situation, the Bank Monte dei Paschi di Siena intervened in the capital of Ultravox , with funding of 8.5 billion pounds . Then Remained only the Siena active plant with 200 employees ITS, Ultravox was aquired by Galaxis Holding, the holding company controlled the German Galaxis , in manufacturer of set-top boxes for receiving satellite TV.Initially the company served as a distributor for the Italian Tuscan Galaxis, then later he Specialized in the production of decoders.Under the new ownership The company came back to grow both in terms of turnover and sales, and in 1996, Ultravox became the leading provider of pay-TV decoders for Telepiù (Failed).
In 1998 the company changed name to Siena SpA Production ITS Galaxis and produced TV sets, VCRs and cable boxes for pay TV with Ultravox and Galaxis brands.In 2000, Ultravox-Galaxis is forced to close due to bankruptcy. In the 2000-Ultravox Galaxis is forced to close two to bankruptcy.The brand Ultravox " reappears " on the market in 2007 by a distributor in Campania (Italy) with Autovox another Italian brand. .........................