Futterman (Harvard Electronics) H3 OTL Power Amp Audio Asylum Trader
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.
Винтажный ламповый усилитель Futterman H3 OTL YouTube
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
RARE PAIR of ORIGINAL Julius Futterman model H3AA OTL amplifiers Stereo pair, 1 owner, S/Ns 58
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.
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
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 H3AA OTL tube amp classic, restored and rare SALE PENDING Photo 2592473 US Audio Mart
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.
Julius Futterman H3 OTL made by Tech Instruments Corp. under license Tube Audiogon
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
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 (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.
Futterman H3aa Otl Mono Amplifiers Tube Audiogon
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 H3AA OTL tube amp classic, restored and rare SALE PENDING Photo 2592467 UK Audio Mart
[ Alert Moderator ] Bringing up Futterman H3 with OA2 and 5651 tubes ??? Posted by rogerh113 (A) on December 19, 2023 at 15:35:28 Hello, I am ready to bring up my rewired Futterman H3. I have used a variac to bring up the amp without tubes to check the transformer and power regulation capacitors. All seems fine.
RARE PAIR of ORIGINAL Julius Futterman model H3AA OTL amplifiers Stereo pair, 1 owner, S/Ns 58
CHERYL S FUTTERMAN, PhD - NPI #1952479990 Psychologist. NPI Profile for Dr CHERYL S FUTTERMAN in MILLBURN, NJ.. A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of.
Futterman H3 OTL ldsound.ru (1) ldsound.info
The difference between an H3 and H3a is that Futterman used one single very large electrolytic capacitor to couple the output to the speaker, in the H3. In the H3a, he went to using a gaggle of physically smaller photoflash capacitors, which were the fastest available in his day.
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
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 monoblocks. All new output tubes. All new caps. Ready for the next 50 years
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
Futterman (Harvard Electronics) H3 OTL Power Amp Audio Asylum Trader
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.
