[roscoe65]

The Sweet 807 is one of Dennis' older amps.  If he were building one today he may make different design decisions.

[FullRangeMan]

If possible variable NFB would be useful to adapt the amp to the speaker.

[opnly bafld]

The Sweet 807 is one of Dennis' older amps.  If he were building one today he may make different design decisions.

............ and his newer amps are much more flexible. 

I bought the 807 4 years ago. 

[roscoe65]

The evolution on these has been pretty rapid.  I bought a KT88HO a year ago and it has had two major changes since then; a change from a 6dj8 driver to 6sn7 and the more recent change to the IIPS.

I think some of this is an artifact of Dennis' business model.  He is as much entertaining himself as making a profit.  This is a retirement business for him.

[danabunner]

Wow beautiful amp, what are your impressions on the sound quality?

It sounds open, detailed, vocals are superb, bass is solid for a tube amp.  It changes based upon which tubes I have in it.  With 6V6 and 6P3S-e, it is a bit more midrange forward/detailed.  With a 6SL7 driver tube, even more so.  With KT120 it is more neutral, with deeper, tighter bass.  With EL34 it is more classic tube, a little less high end detail, a little fuzzier on deep bass, very smooth midrange.  It can be a bit different with different 6SN7 driver tubes.   So you can tailor the sound to your preferences, your speakers, and your room.  Not in huge swings, in subtle but noticeable ways.   

I find that when I hit on certain tube combinations, in my room and setup, it can be mesmerizing.  A joyous listening experience.

I'd like to try KT150s in it.  I have several different types of power tubes, but none of them.   The KT120 is one of my favorite tubes in it. 

[FullRangeMan]

Dana, Thanks for this report I appreciated.
That 20W OPTs are a peace of mind, it was a wise choice.

[G Georgopoulos]

If possible variable NFB would be useful to adapt the amp to the speaker.

 

[FullRangeMan]

If possible variable NFB would be useful to adapt the amp to the speaker.

Please Note George I just was told variable NFB not possible in this case, since the 807 need NFB due its electrical characteristics.

[G Georgopoulos]

I don't know that tube, i commented  on tube nfb generally,and its effect on many things.Including speakers.

[sebrof]

Please Note George I just was told variable NFB not possible in this case, since the 807 need NFB due its electrical characteristics.

I always thought the 807 was an older version of a KT-66 or 6L6 with a top cap for High Voltage. I owned an amp designed for 807s once, and also used 807s in an Elekit TU-879 amp that was designed for EL34/6L6/KT-88, etc. (with adapters). 
I never read anything about any specific NFB requirement for the 807 tube. 

[FullRangeMan]

I always thought the 807 was an older version of a KT-66 or 6L6 with a top cap for High Voltage. I owned an amp designed for 807s once, and also used 807s in an Elekit TU-879 amp that was designed for EL34/6L6/KT-88, etc. (with adapters). 
I never read anything about any specific NFB requirement for the 807 tube. 

807 is a ''new'' version from the 6L6 and the 1625 is a 12V version from the 807. The 807W was the WWII military version, very robust yet avaliable at low prices, a bargain.
What are your impressions on the 807 sound?

[Freo-1]

807 is a ''new'' version from the 6L6 and the 1625 is a 12V version from the 807. The 807W was the WWII military version, very robust yet avaliable at low prices, a bargain.
What are your impressions on the 807 sound?

The 807/1625 is one of my very favorite tubes for audio.  They are cheap, stout, reliable, and they sound great.


They were developed for this: [size=78%]https://en.wikipedia.org/wiki/AN/ARC-5[/size]


Another under the radar tube that can make a good audio tube is the 6146B/6883B.  As ling as you pay attention to the screen voltage, you can get 100 watts out of a pair of them. 

[sebrof]

807 is a ''new'' version from the 6L6 and the 1625 is a 12V version from the 807. The 807W was the WWII military version, very robust yet avaliable at low prices, a bargain.
What are your impressions on the 807 sound?

I thought they sounded better than the EH 6L6s I compared them to in the little SE kit amp. The 807s I have are NOS (and I believe they were really NOS) RCAs, RCA gray glass, and 807W (the stout little military version).
I have a pair of Quicksilver monos that use 4 each per channel EL34/KT88 etc., and it seemed such a shame to have 8 of those beautiful 807s in a box in the closet, so I ordered adapters so I can use the 807s in the Quickies. I'm excited to see how they sound.

[FullRangeMan]

OK keep me posted when you has any sound impression.

[FullRangeMan]

This a nice point to point SE 6P3P(6L6) 8W and 179.67USD, it even have choke and tube rectification:
https://pt.aliexpress.com/item/New-DIY-6p3p-tube-amplifier-new-computer-case-6n8p-pure-full-set-tube-amplifier/32328403283.html?spm=a2g03.search0103.3.294.Zbx9gS&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10068_10344_10345_10342_10343_10340_10341_10307_10060_10155_10154_10056_10055_10054_10539_10538_10537_10059_10536_10535_10534_10533_100031_10099_10338_10103_10102_10052_10053_10107_10050_10142_10051_10173_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10312_10313_10314_10078_10079_10073,searchweb201603_1,ppcSwitch_5&btsid=dcbebe33-bbde-48ad-a318-13eb387bbfdd&algo_expid=9cda7aca-24f4-4baa-bb52-fbbfa3f59b59-36&algo_pvid=9cda7aca-24f4-4baa-bb52-fbbfa3f59b59
This is something more, Line Magnetic LM-211IA four EL34 to 15W Triode and 32W UL just 656.99USD:
https://www.hifi-amplifiers.com/en/line-magnetic-lm211ia-hifi-el344-integrated-vacuum-tube-amplifier-p-867.html

[oskar]

How do they sell the Line Magnetic for that price?

[JakeJ]

Not to mention the LM is only available in 220 - 240 VAC.

[FullRangeMan]

How do they sell the Line Magnetic for that price?

That is a Chinese shop, in China the prices are this low in all brands.
There is no freight included, there is no import custom tax and the huge profit margin of the American dealer.

[FullRangeMan]

SPECIAL OFFER LINE MAGNETIC
LM-217IA 300B 8W only 698USD + ship:
http://www.cattylink.com/lm217ia.html
LINE MAGNETIC LM-217IA VACUUM TUBE INTEGRATED AMPLIFIER
FEATURES:
Typical 300B fantasy single ended class A tube amplifier
All point to point wiring (hand soldering)
2 x 12AX7 and 2 x 12AU7 for pre-amplifier session
5U4G and 5AR4 for vacuum tube rectification
2 x 300B vacuum tubes for power output
Soft start (about 30 seconds)design for optimum protection
High precision VU meter and bias adjustment knobs on top panel
Hum control knobs on top panel
Special handmade low magnetic leakage Ei power transformer
Special handmade wide frequency response Ei audio transformers
Silver plated high purity copper internal signal wiring
High quality Japan ALPS motorized volume control
Elegant remote control unit
4ohm / 8ohm selectable output load impedance
Removable metallic tube protection cage included
Detachable power cord system (IEC)
TECHNICAL:
Power output: 2 x 8W Class A
Frequency Response: 10 Hz - 50 kHz, -1.5db
Input sensitivity: 180mV
Input impedance: 100Kohms
Output load impedance: 4ohms, 8ohms selectable
THD+N: ≤ 1 %/ 1Khz
S/N ratio: ≥ 87 db
Power Consumption: 90W
Dimension W x H x D : 376 x 191.5 x 345 mm
Voltage Standard Available: 220V, 230V, 240V
[/b]