The three crystals are used for USB, LSB and CW in the product detector. Each crystal tests within 100 Hz on my test set-up. These were bought as a set some years ago. Thanks for looking. KE5HPY #127

It sounds great! Vintage Gruen Guild 4506 AM/FM/SW1/SW Radio with extras: BFO for HAM reception and 2 x white LED dial light. Please watch the short video: https://www.youtube.com/watch?v=NVzpxrxUlCo I tested the shortwave bands 06.22.2023 evening hours. At 7 MHz and in between 3.5 MHz and 4.0 MHz came in a few HAM operators in SSB mode( I turned on the BFO). Reception in SSB mode is not as good as a digital or PLL radio but I enjoy the conversations in between HAM operators. Without the built in BFO, you can not understand these HAM operators. Great vintage condition with added 2 x white LED dial light plus the original bulb. Antenna is good, original. Radio works great on all bands. HAM reception ( LSB,USB, CW) has an extra BFO oscillator. AFC switch OFF position turns on the BFO. ( AFC switch was replaced to get this function on one side of the switch and other side has the AFC function( This function checked and works good too.) The original dial light works on the original backlight switch. It is a does not stays on momentary switch. The LED backlight switch is hiding and visible in the battery compartment thru the opening. It has three position: OFF, Light on with half brightness and Light on with full brightness. Selling it as is- a very good sounding radio. I can include A4 size schematic diagram of this radio . It is located inside but you dont have to cpen the radio so I can include it free upon a request. Battery mode tested only. The earphone connector is on the bac cover.It is for mono 3.5 mm jack but works with steteo earbuds,but one side only. You need 4 x C battery. I tested it with recharge type battery only. Battery not included for safe shipping.=================================== Technical Specifications from radiomuseum.org: Number of Transistors 13 SemiconductorsMain principle Superheterodyne (common)Wave bands Broadcast, 2 Short Wave plus FM or UHF. Power type and voltage Batteries / addl. power jack / 4 x C 1.5 Volt Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) Material Plastics (no bakelite or catalin)from Radiomuseum.orgModel: Gruen Guild 4506 - Nanaola Nanao Radio Co., Ltd.ShapePortable set > 8 inch (also usable without mains)Dimensions (WHD)10.25 x 7.5 x 3.5 inch / 260 x 191 x 89 mmNotes Made in Japan 506

Philips D2999 BFO Weltempfänger, funktioniert einwandfrei, UKW, MW, LW und KW (146-26100 KHz), intakte und originale Antenne (1,40 m), Höhen- und Bassregler, BFO-Regler, Gain-Regler, Feldstärke/Batterieanzeige, Uhr mit Alarmfunktion, 16 Senderspeicher, Bandbreitenschalter, Reception-Schalter, zwei eingebaute Lautsprecher, Anschluss für Line Out, externen Lautsprecher, externe Antennen und Kopfhörer, Phono und Tape, Maße: 33 x 19 x 8 cm, das Gehäuse ist in gutem Zustand mit nur wenigen Abriebspuren (siehe Fotos), zum Lieferumfang gehört das, was auf den Fotos zu sehen und in der Beschreibung angegeben ist, bitte hier klicken, um meine anderen Artikel anzusehen. English speakers please ask for a translation and shipping price.Click here for all my items in a glance:Anbieterkennzeichnung siehe Michseite

FeaturesNothing in particular.Only the items shown in the photos are for sale.Other items are not included.International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.These charges are normally collected by the delivering freight (shipping) company or when you pick the item up – do not confuse them for additional shipping charges.I do not mark merchandise values below value or mark items as “gifts” – International government regulations prohibit such behavior.

Sangean ATS-803A World Band Radio Receiver with BFO Untested For Parts Or Repair.

Panasonic DR49 BFO Weltempfänger, funktioniert einwandfrei, UKW, MW, LW und 8 x KW, KW-Feinabstimmung, Höhen- und Bassregler, BFO, BFO-Pitch, KW-Kalibrierung, Feldstärkeanzeige, RF-Gain-Regler, ANL, analoge und digitale Frequenzanzeige, Skalenbeleuchtung für beide Skalen, intakte Antenne, Antennentrimmer, Rec Out-Regler, Bandbreitenschalter, Anschluss für Phono, Tape, externe Antennen und Kopfhörer, Maße: 45 x 29 x 18 cm, das Gehäuse ist in gutem Zustand mit nur unscheinbaren Abriebspuren (siehe Fotos), zum Lieferumfang gehört das, was auf den Fotos zu sehen und in der Beschreibung angegeben ist, bitte hier klicken, um meine anderen Artikel anzusehen. English speakers please ask for a translation and shipping price.Click here for all my items in a glance:Anbieterkennzeichnung siehe Michseite

Grundig Satellit 650 Professional BFO, gepflegter, leistungsstarker Weltempfänger, funktioniert einwandfrei, 60 Senderspeicher, UKW, MW, LW und KW, druckvoller UKW-Klang durch 2-Wege-Lautsprecher, BFO (USB/LSB), Gain Control, Bandbreitenschalter, ANL, intakte und originale Antenne (1,45 m lang), Höhen- und Bassregler, Skalenbeleuchtung, digitale und analoge Frequenzanzeige, Feldstärke/Batterieanzeige, motorischer Skalenzeiger, Uhr, Anschluss für Phono, Tape, Line In/Out und externe Antennen, Maße: 50 x 24 x 16 cm, auch das Gehäuse ist in gutem Zustand (siehe Fotos), zum Lieferumfang gehört das, was auf den Fotos zu sehen und in der Beschreibung angegeben ist, bitte hier klicken, um meine anderen Artikel anzusehen. English speakers please ask for a translation and shipping price.Click here for all my items in a glance:Anbieterkennzeichnung siehe Michseite

Parts from my working SB-303 that has served me well for almost 15 years using it every week with my SB-401/SB-200 station. I only had to make a few minor repairs through all the years. Still working when parted out. I acquired a near mint SB-303 as a replacement. All parts sold as is. Clean and deoxit as necessary before using. Sold for parts or not working due to the age of the unit. Please understand, this is a project piece of equipment and no warranty is expressed or implied. It is sold for you to restore or use for parts. There could be other issues with the unit that are yet to be discovered. Will require maintenance sooner or later.