FOUND THIS AT AN ESTATE. SHOWS COSMETIC WEAR FROM AGE WITH SCRATCHES, SCUFFS, DUSTY INSIDE FROM YEARS OF STORAGE. WILL NEED CLEANED UP. PRE AMP ONLY AS SHOWN. PLEASE ASK IF YOU HAVE ANY QUESTIONS THANK YOU!
PLEASE REVIEW PICTURES ONE, THREE, FOUR AND FOURTEEN FOR SOME EXCELLENT INFORMATION SUPPORTING THIS RARE AMPLIFIER’S PROMOTION DURING THE INTRODUCTION OF THE 7591 OUTPUT TUBE. Item is from a smoke free home. Please see all pictures as they are an integral part of this description. Please utilize ZOOM for any extra assistance viewing pictures. Item is in excellent overall condition considering it’s age and item does show some wear/age. Please review all clear pictures and video as they are an important part of this description. Item is free from any large amounts of loose particles inside/outside it’s original metal chassis. Item also looks to be free from any major damage, non original drilled holes, etc. Please also note this unit does power on. (works) Item was briefly tested with a variac as pictures four and six demonstrate. (works) This stereo tube amplifier was always briefly tested with a pair of period Acoustic Research and an early, mono Blue Note pressing as demonstrated. (works) No further testing was completed with this tube amplifier, nothing rigorous. The original ELECTRONICS WORLD magazine is dated 1961, complete and included as shown. All tubes are not included with this listing; only the quad 7591 type stereo amplifier and it’s matching literature/provenance. Please see pictures six and seven for more details concerning the dated 1961 ELECTRONICS WORLD magazine which features THIS 7591 type AMPLIFIER on it’s cover; the piece of paper with repair, update, restorations, specs, etc. Is included as shown and found. There are no dates on the restoration paperwork, please make a note of this as this is a vintage tube power amplifier from the late fifties/early sixties. Considering the rarity of this vintage stereo tube amplifier, it is certain that there are not many period correct “survivors” out there. Item will make a great addition to any vintage audio assortment, collection, etc. As with all vintage electronics, a qualified person and/or technician should go through this item before continuous use. Original Westinghouse/Dynaco type quad 7591 type power tube stereo amplifier. Item(s) is not stated as brand new & sealed in condition. Please see and read (if at all possible) all pictures and utilize ZOOM for more details. Please feel free to ask questions if needed. Thank you for your interest and time. ITEM WILL BE PACKAGED CAREFULLY WITH TIME AND EFFORT FOR SECURE TRANSIT.
Being an electronics tech, I see voltages that are way too high for the designed circuit. Nice looking bucking transformer with stainless cover! Turns device and your equipment on or off. You have a choice of 3% or 7% voltage drop. All vintage tube equipment should be using this voltage reducer. Read on; After WWll and up until 1968, household voltages were 117 volts. Typically voltages these days range from 120-125. Your vintage audio equipment was designed to operate around lower voltages of years ago. You might ask yourself what is a few extra volts? Take into account that the power supply in your vintage device is multiplying those few extra volts many times so that the end result could be 20-30-40 volts more than the circuit was designed for. This could lead to transformer failure, component failure and shorter tube life. As you can see in the photo, the voltage reducer brought the line voltage down from 124 to 116. This is approximately a 7% drop. Simply plug your vintage electronics into the reducer outlet. Will work with equipment drawing up to a total of 4 amps. Has protective 4 amp fusing. Metal box is grounded through heavy duty 3 wire power cord. As an example; Photo shows voltage of Dynaco ST-70 at 467v on todays line voltage and then 438v plugged into the voltage reducer. The correct voltage for this Dynaco amp calls for 435v at this point. Also your filament voltage will be more in line with what it should be. All other voltages are much closer to Dynaco factory specifications with the reducer. Your device will run cooler and safer, extending component, transformer and tube life! Please state voltage drop preference when ordering. Strongly recommended for Dynaco St 70, since they were produced with power transformers designed to operate with 117 line voltage. Your transformer will run cooler, tubes will last longer and all voltages will be closer to where they should be!
This is a vintage Dynaco Mark IV tube amplifier by Dynakit. It was manufactured in the United States and is a rare find. The amplifier has been tested and powers on. Dynakit Dynaco Mark IV Amp vintage rare amplifier. Size is 14x5x6.5. Tested and powers on.
FOUND THIS AT AN ESTATE. SHOWS COSMETIC WEAR FROM AGE WITH SCRATCHES, SCUFFS, DUSTY INSIDE FROM YEARS OF STORAGE. WILL NEED CLEANED UP. PRE AMP ONLY AS SHOWN. PLEASE ASK IF YOU HAVE ANY QUESTIONS THANK YOU!
This vintage DYNACO SCA-80 Integrated Tube Amplifier is a rare gem for audiophiles and vintage electronics collectors alike. Made in the United States, this amplifier boasts a classic design and is in perfect working order. With its brand name Dynaco and model number SCA-80, this integrated amplifier is a must-have for any vintage audio enthusiast. Its unique features include a sleek design, high-quality sound, and durability. Don’t miss out on the chance to own a piece of vintage audio history with this DYNACO SCA-80 Integrated Tube Amplifier.
Don’t miss out on this classic tube amp. It has been rebuilt and is working great! There are signs of its age and there are some paint speckles on the screen. It may not be the prettiest, but it is a beast and performs like one! Some information on the unit. Power output: 35 watts to 8 ohms. Frequency response: 10Hz to 40 Hz. Total Harmonic distortion: 1%. Signal to noise ratio: 90dB. Speaker load impedance 4 to 16 ohms. Please consider giving our shop a follow, we still have so many fun things to list! As always, thanks for looking, and have a great week!
Dynaco Stereo 80 ST-80 Amplifier. Has All 4 Original Feet. Cord Has No Cracks. No Signs Of Corrosion. Lamp On Power Switch Works. Outstanding Condition And Sonics. Please Examine Photos Closely For Cosmetic Condition. Other items From My Collection May Be Viewed In My Listings. A rare piece greatly appreciated by audiophiles and not often seen. A Fantastic Addition To Any Vintage Collection. Power output: 40 watts per channel into 8? (stereo). Frequency response: 10Hz to 50kHz. Total harmonic distortion: 0.5%. Input sensitivity: 1.3V. Signal to noise ratio: 90dB. Speaker load impedance: 4? To 16? Semiconductors: 12 x transistors, 10 x diodes. Dimensions: 14 x 8 x 4 inches. The Dynaco Stereo 80 is an all silicon transistor basic power amplifier for use with separate preamplifiers such as the Dynaco PAT-4 or PAT-5 or for use with tape recorders or tuners such as the Dynaco FM-5 which have their own volume controls. The unit contains two 40 watt amplifiers on one chassis with a common power supply. It has been designed to be used under normal conditions without special safety precautions, just as if it were a high grade tube amplifier. There are no circuit breakers, speaker fuses, or other resettable devices to impede the use of the Stereo 80 under any reasonable conditions of use or abuse. This is achieved by using novel circuits (on which patents are pending) which automatically and instantly protect the amplifier. The components are of the highest quality to protect against failure, both now and for many years in the future. All parts are used conservatively with close tolerances to assure proper operation, and etched circuit modules are pretested under actual use conditions to ensure that every unit, after assembly, will meet the specifications normally associated with laboratory prototypes. The specifications of the Stereo 80 speak for themselves. The distortion at low levels is comparable to that of the finest tube designs, while the high power distortion remains inaudible. See my other auctions for a matching Dynaco PAT-4 Stereo Preamplifier to mate with this. Please check my other auctions for more vintage electronics.
As always, these amps are wonderful but too bad I’m limited in space so I can’t keep all the gear I find! See photos for physical condition of the outside and inside of the amp. FYI, the mono switch is noisy if engaged, and the power switch can cause a small pop if not flipped quickly. They both will eventually need to be replaced but I don’t have the time. Restoration included: HIGH quality F&T electrolytic caps; new coupling caps for the driver board; replaced the selenium rectifier with a diode, and added diodes prior to the rectifier tube for added power supply stability. Swapped out the 7199s with a pair of 6UA8s from Tube Depot back in June. Probably have 10 hours on them. Tubes are not guaranteed as I don’t have a tube tester. Tubes included are 4 mixed EL-34s, and 2 6UA8s, Tung Sol GZ34. Here’s video of the actual unit in my system. Photos demonstrate the physical condition. I’m in Palm Springs, CA 92262.
