Futterman H3 OTL ldsound.ru (5) ldsound.info
Futterman H3 OTL Julius Futterman was the first to realize the dream of a commercial output-transformerless tube amplifier, albeit for a brief period. Its life span was extended for a few more years by New York Audio Labs. Dynaco ST-70
Futterman H3AA OTL tube amp classic, restored and rare Photo 2592469 US Audio Mart
1259203372 The Hub: Futterman H3: Seen one lately? Back in my days as a teen audio geek, an item that popped up in a little classified ad in the back of Audio magazine (in type so small I couldn't even read it now) was "Futterman OTL amp", with comments about its transparency and beauty with Quad electrostatics.
Futterman (Harvard Electronics) H3 OTL Power Amp Audio Asylum Trader
The NYAL OTL-3 and the Prodigy P3 OTL are pretty much the same amps circuit wise except for a few minor changes. The only thing that strikes me as strange is that the P3 schematic I have shows considerablly lower running voltages then the original Futterman h-3 schematic using say 6FW5's of 6BH5's.
Futterman (Harvard Electronics) H3 OTL Power Amp Audio Asylum Trader
Julius Futterman H3 OTL for sale. This a great opportunity to buy a rare Futterman H3 OTL, built under license from Julius Futterman by Tech Instruments Corporation. It has been upgraded by Ted Hammond with high end resistors and c. Julius Futterman H3 OTL for sale.
Futterman (Harvard Electronics) H3 OTL Power Amp Audio Asylum Trader
Futterman H3 OTL 0 Members and 1 Guest are viewing this topic. Read 1227 times. hifibuff. Jr. Member; Posts: 42; Futterman H3 OTL « on: 22 Jul 2019, 07:33 am.
RARE PAIR of ORIGINAL Julius Futterman model H3AA OTL amplifiers Stereo pair, 1 owner, S/Ns 58
Futterman H-3A power amplifier Specifications Sidebar: Specifications Description: All-tube output-transformer-less stereo power amplifier. Output: 90Wpc with 16-ohm load. Frequency response: 5Hz-90kHz, +0, -0.5dB; -3dB at 200kHz. IM distortion: <0.05% at 90W (continuous sinewave) into 16 ohms. Damping factor: 200.
Futterman H3AA OTL tube amp classic, restored and rare SALE PENDING Photo 2592473 US Audio Mart
I am servicing some nice tube gear and tone arms for a pal of mine, retired from the Pro Mastering / recording studio supply / importing / consulting business - Today I delivered 3 restored Marantz 7c's to him and he put this unit in my car to check out. He MAY have the service info.
Futterman H3AA OTL tube amp classic, restored and rare SALE PENDING Photo 2592472 UK Audio Mart
3. What about 6 JJ Tesla EL509's per channel? Current wise that will match the 6FW5's since they have a max of 550mA and the JJ's are 500mA. 6 replaced by 6 does not cause me a transformer issue. The 6FW5's are octal as are the JJ's.
Futterman H3AA OTL tube amp classic, restored and rare SALE PENDING Photo 2592468 Aussie
The Futterman H3-A is one of these rarities—an amplifier designed primarily to complement one of the best, and one of the hardest-to-drive loudspeakers on the market: the KLH Model Nine . The H-3A is unusual in another respect, too.
Julius Futterman H3 OTL made by Tech Instruments Corp. under license Tube Audiogon
Today I heard a Futterman OTL powering a pair of Quad ESL57s. The Futterman has been recently serviced and is in nice shape.. Futterman OTLs are the Holy Grail of tube amplifiers! I have three. A Harvard Music H3 using four 6HB5's per channel and a pair of H3aa's using six 6LF6's per mono amp. I have two pairs of Quad 57's and a pair of KLH.
Futterman H3AA OTL monoblocks. All new output tubes. All new caps. Ready for the next 50 years
The Futterman H-3 was one of Julius Futterman's first commercially produced (OTL) amplifiers, marketed under the name of Harvard Electronics. Hand-made by Futterman in small numbers, these highly prized collectors items are quite rare today and insufficient data is available to place a current value on them.
RARE PAIR of ORIGINAL Julius Futterman model H3AA OTL amplifiers Stereo pair, 1 owner, S/Ns 58
Details Hi-Fi equipment Power type and voltage Alternating Current supply (AC) / 110-125 Volt Loudspeaker - This model requires external speaker (s). Power out 100 W (undistorted) Material
RARE PAIR of ORIGINAL Julius Futterman model H3AA OTL amplifiers Stereo pair, 1 owner, S/Ns 58
Extremely rare Futterman (Harvard Electronics) H3 OTL Stereo Power Amplifier. First owner and in very good condition. Acquired in 1980 and rarely used only by the owner. Julius Futterman himself modified this unit and put date and his signature on the underside of the transformer. (see picture)
Futterman H3AA OTL tube amp classic, restored and rare SALE PENDING Photo 2592467 UK Audio Mart
The Futterman OTL-1 can provide 150W into a 16 ohm load, 65W into an 8 ohm load, and 35W into a 4 ohm load; it's effectively current-limited into loads below 16 ohms, but this is nevertheless an extraordinary amount of power for an OTL amplifier.
FUTTERMAN H3 オリジナルOTLパワーアンプ入荷しました・・ 無限堂会長の公開日誌｜厨房、事務、工具の中古屋
Futterman OTL mono tube amps, pair Listing ID: lisafbhg Classified Listed February 8, 2022 2:59pm · 461 Views michaelbrenden member since November 2020 1 Watcher Items from this seller This listing has ended. Listings Similar to Futterman VAS Industries Citation Sound 2 $3,000.00 Allnic Audio A-2000 SE Stereo Tube Power Amplifier; (5. $4,899.00
Futterman H3aa Otl Mono Amplifiers Tube Audiogon
Futterman H3. Thread starter rdiiorio; Start date Jul 18, 2022; Tags futterman h3 rdiiorio New Member. Jul 18, 2022 #1. Show your OTL Tube Amplifiers ! tubelectron; Jul 4, 2022; Tube Audio; 2 3. Replies 41 Views 3K. May 14, 2023. tubelectron. T. Harvard (Futterman) OTL H3 w/ 6 6FW5 Tubes / Channel.