{"product_id":"1967-ampeg-gs-12-r","title":"1967 Ampeg GS - 12-R","description":"\u003cp dir=\"ltr\"\u003e\u003cspan\u003eBlue Note Music\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eAmplifier Authentication \u0026amp; Evaluation Checklist\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eBASIC INFORMATION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eManufacturer: Ampeg\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eModel: GS - 12 R\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSerial Number: 038891\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCircuit Designation: Reverb rocket II\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eEstimated Production Year: mid to late 1966\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCountry of Manufacture: USA\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003ePRIMARY AUTHENTICATION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSerial Number Verification\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eChassis Inspection: No stamp, no added holes, no modifications\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCircuit Verification: early circuit distinguished by the 6U10 Compactron Tube\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCircuit Identified As: GS-12-R\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePower Transformer: PT-110V 682623\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOutput Transformer: OP-151A 682622\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePotentiometer Codes: 1376623 137 CTS 23rd week of 1966\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eTube Chart \/ Factory Labels: Present and original\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eCABINET AUTHENTICATION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eConstruction: Original not modified - Pine\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCovering: Original\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eType: Tolex\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eGrill Cloth: Original\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eHardware\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eHandle: Original\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCorners: Original\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFeet: Original\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eLogo: Original\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eTRANSFORMERS\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePower Transformer: PT-110V 682623 is consistent with mid to late 60’s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOutput Transformer: No EIA manufacturer or date code visible\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eSPEAKER SYSTEM\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSpeaker Configuration: 1x12\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSpeaker Manufacturer: CTS\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSpeaker Codes: 137\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSpeaker Assessment: Original in good working order\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eELECTRONICS AUTHENTICATION\u003c\/span\u003e\u003c\/h3\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eCapacitors\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFilter Capacitors: Yellow axial electrolytic caps are replacements. Green Cornell Dubilier film caps are replacements. One blue resistor appears newer than the others. The large red electrolytic cap is a replacement\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCoupling Capacitors: Partial replacement\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eWiring Harness: Original\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSolder Joints: Original with Caps exception\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eTUBE COMPLEMENT\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePower Tubes: Sylvania 7591 correct for the era, appears original\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePreamp Tubes: Amperex 12ACX7 ECC83 - appear original\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eMODIFICATIONS\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFunctional Modifications: None \u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eSTRUCTURAL CONDITION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCabinet: Minor wear\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eChassis: Excellent\u003c\/span\u003e\u003c\/p\u003e\n\u003ch1 dir=\"ltr\"\u003e\u003cspan\u003eFINAL EVALUATION\u003c\/span\u003e\u003c\/h1\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eCondition Grade: B\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cb\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eA+ — Exceptional \/ Collector Grade\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOutstanding originality and condition. Among the finest examples likely to be encountered.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eA — Excellent\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eHighly desirable example with only minor wear and no significant issues.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eB — Very Good\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eStrong vintage example with normal wear and minor repairs or service replacements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eC — Good Player Grade\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFunctional amplifier with noticeable modifications, repairs, or originality loss.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eD — Project Grade\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eRequires significant repair, restoration, or maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eF — Parts \/ Salvage Grade\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eMajor damage or missing components make restoration impractical.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eOriginality Grade: 02 - Mostly original\u003c\/span\u003e\u003c\/h3\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eStructural Grade: S1 - Excellent\u003c\/span\u003e\u003c\/h3\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eRepair Grade: R0 -  no work recommended\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eAuthentication Confidence: High -  John Maynard\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFINAL NARRATIVE SUMMARY\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003e1966 Ampeg GS-12R Reverb Rocket II\u003c\/span\u003e\u003cspan\u003e is an authentic and highly desirable vintage American tube amplifier that represents one of Ampeg's most respected mid-1960s designs. Authentication confirms the amplifier retains its original pine cabinet, tolex, grille cloth, hardware, chassis, wiring harness, factory labels, CTS speaker, and the distinctive early Reverb Rocket II circuit featuring the sought-after \u003c\/span\u003e\u003cspan\u003e6U10 Compactron tube\u003c\/span\u003e\u003cspan\u003e, making it an excellent example of this model. The amplifier has received thoughtful maintenance over its lifetime, including replacement filter and select coupling capacitors along with one resistor—common and desirable service items that enhance long-term reliability while preserving the originality of the circuit. It also retains what appear to be its original-era \u003c\/span\u003e\u003cspan\u003eSylvania 7591 power tubes\u003c\/span\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cspan\u003eAmperex ECC83\/12AX7 preamp tubes\u003c\/span\u003e\u003cspan\u003e, further adding to its authenticity and collectability. Graded \u003c\/span\u003e\u003cspan\u003eB (Very Good)\u003c\/span\u003e\u003cspan\u003e for condition with an \u003c\/span\u003e\u003cspan\u003eOriginality Grade of O2 (Mostly Original)\u003c\/span\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cspan\u003eStructural Grade S1 (Excellent)\u003c\/span\u003e\u003cspan\u003e, and \u003c\/span\u003e\u003cspan\u003eRepair Grade R0 (No Work Recommended)\u003c\/span\u003e\u003cspan\u003e, this amplifier offers an outstanding balance of originality, reliability, and investment potential. With its rich Ampeg clean tones, lush tube-driven reverb, and warm vintage character, this Reverb Rocket II is equally appealing to collectors, recording musicians, and players seeking a genuine mid-1960s American tube amplifier that is ready to enjoy immediately while remaining highly collectible.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Blue Note Music","offers":[{"title":"Default Title","offer_id":52493297844507,"sku":null,"price":899.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0727\/7048\/6555\/files\/IMG_20260708_122545_1.jpg?v=1783533483","url":"https:\/\/bluenotemusic.com\/products\/1967-ampeg-gs-12-r","provider":"Blue Note Music","version":"1.0","type":"link"}