H. Olson's amps

Zen Mod · 12th May 2007, 12:51 PM

from old " Vintage audio trader" site :

"..........MI-11401. Anybody have a real picture? I had to "
retouch " my bad photo-copies with ink, they were
so faint. These are not really very accurate in
terms of tone contrast, especially the furnace;
Only the top " band ' is dark gray, the rest is light
umber gray. The grill was brushed-satin chrome
The other cabinet is an illustration from an article by H.F. Olson and A.R. Morgan of RCA
laboratories from a 1950 (? ) Issue of Radio and Television News; A High Quality SOUND SYSTEM For the Home. Shown is the original LC1A, with smooth cone ( MI-11411 ). Also, the amplifier he designed to be part of the system. The first 45 rpm record changer is part of the system as well. This is a great article, in which he gives plans and instructions on building the cabinet AND a no- negative-feedback, directly-heated triode amp using one 6J5, one 6SN7, four 6F6 tubes and a 5Y3 rectifier in the power supply. A ten watt amp maybe. In RCA's Living Room Laboratory, sound levels averaging 80 dB were achieved with approximatly 0.050 watt input power. This means low power all triode amplification was more than sufficient. Olson states in the article that they were surprised to determine that a 1/4 to 1/2 watt
amplifier would give satisfactory results in the average room. 2 or 3 per cent distortion from the Amp at 90 dB did not bother him. Not from no feedback triodes. They sound sweet! "

I need any info regarding those amps............
schematic and few free OPT's will be perfect ........

ps. even if I can't find any DHT in list of mentioned toobz .........

Dan_Steele · 21st May 2007, 10:42 AM

The second amp you speak of is listed here I do believe

http://www.bonavolta.ch/hobby/en/audio/6f6.htm

Been building mine off and on for alomost a year now

Zen Mod · 21st May 2007, 11:09 AM

Quote:

Originally posted by Dan_Steele
The second amp you speak of is listed here I do believe

http://www.bonavolta.ch/hobby/en/audio/6f6.htm

Been building mine off and on for alomost a year now

Dan_Steele · 21st May 2007, 11:40 AM

No worries dude,

Richard sherman of http://www.shermanaudio.com has also built his own named the Aurora and is of great help (he inspired me to start mine) he has a section about it on his website,

Its worth noting that the voltage stated 390v X 2 is to much for the 6f6g's I have mine running around 280ish.

12th May 2007, 12:51 PM	#1
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	H. Olson's amps from old " Vintage audio trader" site : "..........MI-11401. Anybody have a real picture? I had to " retouch " my bad photo-copies with ink, they were so faint. These are not really very accurate in terms of tone contrast, especially the furnace; Only the top " band ' is dark gray, the rest is light umber gray. The grill was brushed-satin chrome The other cabinet is an illustration from an article by H.F. Olson and A.R. Morgan of RCA laboratories from a 1950 (? ) Issue of Radio and Television News; A High Quality SOUND SYSTEM For the Home. Shown is the original LC1A, with smooth cone ( MI-11411 ). Also, the amplifier he designed to be part of the system. The first 45 rpm record changer is part of the system as well. This is a great article, in which he gives plans and instructions on building the cabinet AND a no- negative-feedback, directly-heated triode amp using one 6J5, one 6SN7, four 6F6 tubes and a 5Y3 rectifier in the power supply. A ten watt amp maybe. In RCA's Living Room Laboratory, sound levels averaging 80 dB were achieved with approximatly 0.050 watt input power. This means low power all triode amplification was more than sufficient. Olson states in the article that they were surprised to determine that a 1/4 to 1/2 watt amplifier would give satisfactory results in the average room. 2 or 3 per cent distortion from the Amp at 90 dB did not bother him. Not from no feedback triodes. They sound sweet! " I need any info regarding those amps............ schematic and few free OPT's will be perfect ........ ps. even if I can't find any DHT in list of mentioned toobz ......... __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

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21st May 2007, 10:42 AM	#2
Dan_Steele diyAudio Member Join Date: Jul 2006	The second amp you speak of is listed here I do believe http://www.bonavolta.ch/hobby/en/audio/6f6.htm Been building mine off and on for alomost a year now

21st May 2007, 11:40 AM	#4
Dan_Steele diyAudio Member Join Date: Jul 2006	No worries dude, Richard sherman of http://www.shermanaudio.com has also built his own named the Aurora and is of great help (he inspired me to start mine) he has a section about it on his website, Its worth noting that the voltage stated 390v X 2 is to much for the 6f6g's I have mine running around 280ish.

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