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Single sheet, 2 pages in excellent condition. Very good condition, with little wear. This is for their Watt per channel power amplifier. Excellent condition. This is for their 75 Watt per channel integrated amplifier. This is a pair, the four-page, fold-open spec sheet and the eight page product analysis from a hifi magazine.

This is a pair, the four-page, fold-open spec sheet and the six-page, fold-open product analysis from a hifi magazine. This instrument was booed by many because it only worked on scratches and ignored most little clicks and pops. However, it did a great job on big clunks and scrateches. This is a photocopy made for our researcyh, but will be quite useful for owners who may not have one. This is a photocopy. This is an old photocopy. It contains a service schematic as well as a parts list with photos designating parts locations.

Schematics, Service Manuals and Vintage Radio Publications

This is a group of flyers relating to tape decks and tape from a variety of manufacturers, mostly from the early 's. The Audio Devices "Audio Record. Craftsmen was formed on the remains of the old E. Scott Radio Labs. These tuners form a bridge from E. Scott to modern audio components. Scott radio receiver, such as a Phantom. This is a two-piece shield and the cap has a slot to permit the wire for a grid wire attachement. Chrome is good; there is no rust. The literature consists of manual, advertising flyer and magazine review.

Great if you have the speakers and want complete paperwork. It is perfect for suburban home TV and FM distribution from an antenna. It works well on modern HD systems. Used and in good condition. Specs are here. Several hundreds of pages of uses for various linear integrated circuit devices. This is a huge manual with many fold out diagrams. It is 2inches thick on the flip edge. Not a gobbledy gook techno nightmare. This is for their portable DC to AC power supply. Thick manual with fold out diagrams and illustrations. Arms and headshells. Cartridge Styli. Preamps Equalizers Electronics.

Noise Reduction. Restoration Services. Reviews Links. Balkan Records.

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Vintage Recordings. See Here. This the January issue of Audio Magazine. Issue is in mint condition. See large. One of our Universal Walnut Cases , but with a problem. Click image for large size. Aphex Compellor. Demo Trovatore turntable used for show and tell. ELAC Miracord spindle for single play. Garrard spindle. Looks like for an AT, but am unable to confirm it. It comes with a new warranty. ADC-K8 cartridge body only, with stylus guard.

Coil resistance is Ohms. This is a brand-new Arista replacement ceramic turnover phono cartridge. Cartridge mounting brackets for Shure Professional arms M and M Dustmaster AC record cleaner brush, new in box. Dustmaster AC record cleaner brush, new in bulk packagin. This is a used rubber mat from a vintage Rek-O-Kut turntable. Excellent working condition.

No-name tape head demagnetizer. Plastic NAB adapters.

Wire Diagrams & Radio Sheets

Price is for the pair. Simple NAB adapters. Set of NAB adapters for many tape decks. Aside from that, it is an NAB reel and in good condition. Sony E-Mount, auto-focus extenders. Two unused 52 mm extension tubes for front of lens spacing. Included are 13 mm and 28 mm extensions,. Quantary 52 mm close-up lenses in carrying case.

The A. All pages are intact. McIntosh MC amplifier instruction manual with service schematics and measurements. McIntosh 20W-2 amplifier instruction manual with schematics and parts list. MR80 FM tuner service manual.


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Alesis Compressor Reference Manual. In March , besides the Harko Senior, also a two stage audio amplifier was offered for it in a matching cabinet. Soon Crosley sold units of Harko Senior sets. At the same time some radio magazines, like "Radio Broadcast" May and "Popular Radio" began to enrich the radio industry. In often companies could not fulfill their orders due to the too big demand.

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In May Crosley could move into the new 3 story brick-and-stone building at the corner of Colerain Avenue and Alfred Street , two miles south of Blue Rock, a building with thirty thousand square feet of space. In Summer the sunspot interference peaked and sets without regeneration had poor and only local reception. Also the many stations on m became a big problem. Many sets came back from customers and piled up. The missing regeneration, a patent from Armstrong, was badly missed.

A metal faceplate shows: "Crosley regenerative tuner manufactured exclusively for Crosley Manufacturing Co. Patent No. Tri-City was also manufacturing receivers for the Montgomery Ward chain store, subcontracting Briggs and Stratton of Chicago. Crosley was then one of the largest radio manufacturers, producing in three Crosley factories. Crosley sent out the first "Crosley Radio Weekly". Hoover set up another broadcast wavelenght, meters and a Class "B" station with a minimum of watts. Crosley applied for that license and set Dorman Israel to work for a new transmitter and antenna.

By November WLW could be heard from coast to coast - because the station operated at times with up to a thousand watts. Crosley for a short time made also headphones. A single headphone earpiece is the driver unit. RFTA Amp. This is worth an article by Konrad Birkner. See there why this was in fact a TRF Audion. Two-Stage A. Amplifier 2-Step A. The first Harko Senior is most probably the one with only a 3 step switch and overhanging lid.

See the ad February in "Radio News", page In May, "Radio Broadcast", page 81 is shown the combination with 2-Step-Amp, the Harko Senior having a 5 step switch and overhanging lid. All other ads we know show a 7-step switch and we don't know of existing others.

Harko Sr, also called Harko Senior first is without regeneration. For some time it has an overhanging lid cabinet, then an integrated lid. We don't know yet if the different construction of the Rheostat fall into the same change and why the schematic shows only 6 positions, but the model shows seven - all with wire connections. But we have to clear the pictures and dates of the Harko. We show 9 Harko models. Harko Sr. Ace We have no evidence for and believe it is a model. We have no evidence for and believe it is a model. There may also be this model X 10 as an other version?

I have to clear the versions.. XX is a model X with console.

History of the manufacturer

In February Crosley Mfg. We show a page with 8 different " Various Combinations " suggested by Crosley. There you see that the Harko Radio Receiver was also offered inclusive antenna etc. The peep holes have no metal rim but the V-T socket has already "hollow throats". They were likely done in October - for the Christmas business. Since the XII-S was a new model the ad was probably hurriedly put together. The featured models were X p. V and Tos Steo Autiod Amp. I think Part of page 11 Crosley catalog late Most of the early Crosley Harko sets have a stamped front panel for the legends.

There was also a later Harko Senior made that shows an engraved front panel. This set has the Crosley logo with the lightning bolt through it and below it it has "Harko Senior" engraved in the front panel. There is quite some work open to get the different variants with pictures. Picture from member Alan Larsen. This here was written by him on his 3rd day as a new member! Only with some tricks, Crosley could withstand the problem of the sunspot interference mentioned above. By swopping tubes and shortcutting a component the combination acted as a tuned audion with RF-stage. First it was common, from about October it showed an interesting own construction.

See below. The Audion "grid combination" is in one piece. Picture Alan Larsen. Still in work!

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All posts below In the first days of the year, Powel bought Precision including the station, store and remaining stock for 40 thousand dollars and then Lewis had to close that company, hiring some of the personnel. Sets that came back could now get the regenerative circuit, a nwe nameplate and could be sent out again. A full page appeared in Febraury "Radio Broadcast" about the acquisition. Crosley Mfg. Ad in "Radio Broadcast Advertiser" May You can compare the Harko Senior with the ones from Crosley features "Crescendon", a knob for distant weak reception, all-metal shielded chassis, singel-dial station selector single drum control and "The Acuminators", for tuning weak stations - one can wonder what is the difference to the "Crescendon".

Magazine "Women's Home Companion", October , page The same models are shown in "The Crosley Broadcaster" September , page Radio Retailing was most probably the most often used magazine for dealers. For bigger advertisers most radios were covered in some way - either by ads or by short articles with some pictures by the editors.


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Together with Crosley folders and fliers we will get a rather true picture if we keep record here of the facts we can discover. Not mentioned on page 46 for new products. Playtime Jr. SH, 24 24 25 47 80 and 27 None page 47 new. New page the same are listed with some details. C refrigerator.

General text Missing pages 35 to 44 with "New"! But Crosley is page 46 - only "Temporator" heater-fan. All with pictures. New: none on page Because she told me that she looked up also a book from Mark V. Stein, I looked up the many folders I bought from him, together with many magazines. They were devised from various common objects.

One common type was made from an oxidized razor blade rusty or flamed with a pencil lead pressed against the blade with a safety pin. The oxide layer on the blade and the point contact of the pencil lead form a semiconductor Schottky diode and only allow current to pass in one direction. Only certain sites on the blade acted as diodes, so the soldier moved the pencil lead around on the surface until the radio station was heard in the earphones. The aerial is connected to the grounded inductor. The coil has an internal parasitic capacitance and therefore acts as a resonant circuit tuned circuit with a specific resonant frequency.

By varying the inductance with a sliding contact arm, a commercial crystal radio can be tuned to receive different frequencies. Most of these wartime sets did not have a sliding contact and were only built to receive one frequency, the frequency of the nearest broadcast station. The detector and earphones were connected in series across the coil, which applied the radio signal of the received radio station.

The detector acted as a rectifier , allowing current to flow through it in only one direction. It rectified the oscillating radio carrier wave , extracting the audio modulation , which passed through the earphones. The earphones converted the audio signal to sound waves. Richard Lucas built his earphones by binding four nails together with cloth then winding wire and dripping wax over the turns. After about ten layers of wire he placed it in a piece of bamboo. A tin can lid was placed over the coil of wire. The listener connected the improvised earphone to the foxhole radio and received three radio stations.