Vintage Tube Amp

Specs from the original manual. Power Output : 50 watts per channel continuous RMS from 20-20k cps; 100 watts monophonic operation. Frequency Response : 14-45k cps at +/- 1dB at 50 watts. 2-100k cps +/- 1dB at 1 watt. Harmonic Distortion : Less than 0.5% at 1000 cycles at 50 watts each channel; 0.75% from 20-10k at 50 watts each channel. IM Distortion : Less than 0.5% at 50 watts equivalent sine wave power, 60 and 7k cps; 4:1 ratio; less than 0.15% at 10 watts equivalent sine wave. Sensitivity : 1.0 volt RMS input fro 50 watt ouput. Hum and Noise : Better than 90db below 50watts/. Damping factor: 15 at 1 KC – 16ohms. Feedback : Over 50dB in six multiple loops. Output Impedance : 4, 8, and 16 ohms per channel. Controls : 4 bias controls; 2 AC balance controls; Meter selector switch; Power on/off switch. Tube complement: (Total of 10) 4 – 7027A, 2 – 6BR8A, 4 – 6CL6, plus 5 silicon diodes. Dimensions : 17″ wide x 12-1/2″ deep x 8-1/2 hgihg. Power Consumption : 350 watts at 117 volts, 50-60 cps AC. The KT-550 was legendary engineer Stu Hegeman’s last work for Lafayette before he moved to Harmon Kardon. The circuit of the KT-550 is the direct predecessor of the HK Citation II, and is extremely similar. I have had this example for about 1 1/2 years now. I found it in original and very dusty condition at a neighbor’s garage sale, gave it a very thorough cleaning, and performed a full electrical restoration with the parts and values recommended by Jim McShane. The only passive components that have not been replaced are six of the wire wound resistors that measured in spec. The power supply now uses 1000 PIV fast/low noise UF5408 diodes for rectification and higher value capacitors from JJ, F&T, and Nichicon. Film capacitors are Solen PPE, Russain paper-in-oil K40Y-P, Cornell Dubillier “orange drops”, and Panasonic. Small-value caps are Cornell Dubillier silver mica. Resistors are all very high quality units from of Precisions Resistive Products, Vishay-Dale, Mills, KOA Speer, Allen Bradley, etc. 221 screen stopper resistors were also added on the power tubes. A full parts list is available on request. The 6CL6s and 6BR8As are the strong-testing vintage units that were in the amp when I got it. The 7027As are reissue Tung Sols with approximately 100 hrs on them. Input jacks have been replaced with modern gold-plated jacks, and a three-prong power cord was installed in place of the original non-polarized cord, with earth ground tied to the chassis for safety. The bias meter works perfectly, meaning that setting it to the indicated mark does in fact result in the correct current through the power tubes. The AC balance setting does not work. However this is moot since the original method of measurement didn’t reliably have better results than just setting the pots in the center. The AC balance has been set for the current tubes, however, by matching the signals at the power tube grids of each section as closely as possible with a dual channel oscilloscope. Actual power output at the onset of clipping is around 40wpc. I can provide 1kH and 10kHZ square wave samples as well if that tickles your fancy. The paint on the transformers and chassis has its share of scrapes and scratches, as seen in the photos, but it’s still a very handsome piece with a nice patina. Internally, some of the potting material from the power transformer has liquified and oozed down through the hole in the chassis. This doesn’t affect anything, but in case you’re curious what the black blob above the choke in the 5th photo is, there’s your answer. The amp will come with a copy of the original assembly and operating manual as well as all of the original components that were replaced. The amplifier works as expected, and sounds incredible. It’s been a labor of love and I’ve enjoyed it thoroughly, but I’ve found I prefer the sound of other topologies, so I’ve decided it’s time to pass this along to someone who will use it. Please let me know if you have any questions or would like additional pictures of anything. The item “Lafayette KT-550 Vintage Tube 50WPC Power Amplifier Fully Restored” is in sale since Saturday, August 28, 2021. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “aaron.talcott” and is located in Livingston, Montana. This item can be shipped worldwide.

• Brand: Lafayette
• Type: Power Amplifier
• Model: KT-550

Who is Johnny Roadhouse. Drum Sticks & Mallets. Folk & World Instruments. Books and DVD’s. Selmer TruVoice Bassmaster Fifty. There is a fault which causes the amp to emit a loud buzz if certain knobs on the front panel are pushed. Back cover is missing. Please look at all the photos carefully and feel free to get in touch with any questions. Check Out Our Manchester Showroom. Johnny Roadhouse Music is home to a huge range modern and traditional instruments. A vast array of instruments and accessories accross three floors. Folk, Brass & Woodwind upstairs – Guitars, Amps, Keyboards on the ground floor – Drums & Percussion downstairs. We are an independent, family-run high street musical instrument shop based in Manchester, UK. A three-floor superstore, all instruments and equipment. Established over 55 years in the same spot on Oxford Road. We sell everything from Guitars to Accordions, Drum Kits to Didgeridoos, Banjos to Synthesizers, Gu Zhengs to Ouds. We specialise in both new and pre-owned gear. We are run by musicians, for musicians – always committed to serving the musical community and offering the best customer experiences possible. We are here to help, don’t hesitate to get in touch if you have a question or need advice. Please note, if you are collecting the item from our shop in Manchester, we ask for cash/card on collection. 123 Oxford Road All Saints. Hohner Special 20 Harmonica (Mouth Organ/Harp) – All Keys Available FREE UK P&P. Hohner Marine Band 1896 Harmonica (Mouth Organ) – All Keys Available FREE UK P&P. Hohner Blues Harp MS Harmonica (Mouth Organ) – All Keys Available FREE UK P&P. Hohner Golden Melody Harmonica (Mouth Organ/Harp) All Keys Available FREE UK P&P. For NEW items we can offer a VAT receipt with the VAT displayed separately. For PRE-OWNED items we cannot display the VAT separately. We operate under the MARGIN VAT scheme for second hand items, the rules of this scheme do not allow us to offer a VAT breakdown on pre-owned items. Boss ME-20B Multi Effects Pedal. Hohner Harmonicas, Pro Harp Cross Harp Marine Band Big River Cheap Many Keys. Delivered on time, product as expected. TOA A-2060 60 Watt 100V Line Amplifier. Hope to deal with you again. Guys at shop great. Blackstar ID:60 TVP Combo Guitar Amplifier. VIC FIRTH Drum Sticks Hickory Peter Erskine ORIGINAL SPE WOOD Tip (Pair) VF-SPE. Come and visit us in Manchester! We are Manchesters most famous family-owned and run music superstore. We were established over 60 years ago by Johnny Roadhouse Snr, a professional and world renowned saxophonist who sadly passed away in April 2009. The shop is run by his son, also called John Roadhouse. Guitars, drums, saxophones, banjos, accordions, anklungs & everything in between! We are an independent music shop, we pride ourselves on our customer service. If you have any questions at all, or need advice, dont hesitate to get in touch. Dont see what youre looking for? Cant quite figure out which guitar is for you? Not sure which harmonica key fits your tune? Were always happy to help! Johnny Roadhouse Music 123 Oxford Road Manchester M1 7DU We are a bricks & mortar shop based in Manchester, UK. A three floor superstore cram packed with instruments. On the ground floor is our guitar department – head upstairs for brass, woodwind & folk – and downstairs to drums & percussion. The item “Vintage’60s Selmer TruVoice Bassmaster Fifty Crocodile Skin Valve Tube Amp Head” is in sale since Monday, September 6, 2021. This item is in the category “Musical Instruments\Guitars & Basses\Guitar Amplifiers”. The seller is “joh9″ and is located in Manchester. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Bahrain, Canada, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, South Korea, Switzerland, Taiwan, Thailand, Bangladesh, Bermuda, Bolivia, Barbados, Brunei darussalam, Cayman islands, Egypt, Guernsey, Gibraltar, Guadeloupe, French guiana, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri lanka, Macao, Monaco, Maldives, Martinique, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Saudi arabia, South africa, United arab emirates, Ukraine, Bahamas, Colombia, Jamaica, Kuwait, Panama, Philippines, Qatar, Uruguay.

• Amplifier Type: Head
• Brand: Selmer