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| [#12167] Leak Club for Leakies or Leak user CP Yes, you did. Please see my invitation on 2006-08-04 19:31 message :-) John |
Gingers 正式會員221.xxx.xxx.165 |
2006-08-05 20:04 | |
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| [#12168] Williamson Circuit http://www.cosmos2000.org/audio/william1.htm The Original Williamson Amplifier Into this free wheeling media milieu, Williamson published an article on audio amplifier design, which impressed everyone with the insight into audio amplifier theory. Williamson gave certain criteria for audio amplifier circuitry that broke new ground. Williamson's concepts were valid, his articulation of his ideas into an amplifier were seriously flawed. A basic component of his amplifier was the Partridge transformer, a creation of Dr. Partridge. The Partridge output transformer had a frequency response from 2 to 200,000 Hz. Its output was 10 watts over most of the range. This quality level for an output transformer was a milestone in the development of Hi Fi. Ten watts of audio in 1949 was about the best that most were doing at the time. It is not known that a Williamson produced amplifier was ever offered as a unit to the American market. Williamson himself, an engineer employed by a tube company never produced the amplifier at all. The Partridge transformer was sold in America as a component and was available through electronic distributors. As originally configured, the amplifier was constructed on two chassis, the power supply on one chassis, and the audio circuit on the other. The recommended capacitors were huge oil filled, expensive units with low capacitance. No chassis for the amplifier was available, and had to be cobbled together by the constructor. It was all amateur stuff. At the time, the entire industry was amateur stuff. Even so, the quality of the new component audio was so superior to "set" manufacturers like RCA, Philco and Zenith that the Hi Fi buffs lived in the clouds, so to speak. Their gear was a quantum leap ahead of set manufacturers. .........................A basic component of his amplifier was the Partridge transformer, a creation of Dr. Partridge. The Partridge output transformer had a frequency response from 2 to 200,000 Hz. Its output was 10 watts over most of the range. This quality level for an output transformer was a milestone in the development of Hi Fi. ........................ PARTRIDGE :-)  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 20:21 |
| [#12169] Roger's Williamson Amplifier Re: Rogers KT88 amplifiers Hi John: Ahhhh - the elusive Rogers "Eton" amplifier. It's listed in a 1956- 57 vintage hi-fi catalog that I have. There was also a mention of a pair at a vintage Hi-Fi fair in the USA in an early edition of Sound Practices. It's actually an EL34 mono amp. The tube compliment is (exactly as listed in the catalog) "2 Mullard EL34, Cossor 53KU (GZ34, 5U4GA), 4 Brimar L-63 (6J5)" It's interesting that they actually listed the BRAND of tubes in the catalog listing. Here are some specs: powwer rating 35 watts, feedback 20dB, weight 33 pounds, and price $199.95 (each). That was fairly expensive for back then and for reference, a Marantz model 2 was $198 each. As you can imagine, they are quite rare. Gerry --- In hktubeaudio@yahoogroups.com, "john_keung2002" wrote: ＞ ＞ Hi ＞ ＞ I came across this amplifier today. ＞ ＞ http://i62.photobucket.com/albums/h103/leaklover/ResizeofRM063.jpg ＞ ＞ http://i62.photobucket.com/albums/h103/leaklover/ResizeofRM024.jpg ＞ ＞ May I have any information regarding this amplifier? Thanks. ＞ ＞ John ＞ ----------------------------------------- Richard Please refer to the knowledgeable member of the Hong Kong Tube Audio Club. You may wish to grab the chance to have more info of this amplifier :-) http://groups.yahoo.com/group/hktubeaudio/message/18763 |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 21:33 |
| [#12170] Roger's Williamson Amplifier Ahhhh - the elusive Rogers "Eton" amplifier. It's listed in a 1956- 57 vintage hi-fi catalog that I have. There was also a mention of a pair at a vintage Hi-Fi fair in the USA in an early edition of Sound Practices. It's actually an EL34 mono amp. The tube compliment is (exactly as listed in the catalog) "2 Mullard EL34, Cossor 53KU (GZ34, 5U4GA), 4 Brimar L-63 (6J5)" It's interesting that they actually listed the BRAND of tubes in the catalog listing. Here are some specs: powwer rating 35 watts, feedback 20dB, weight 33 pounds, and price $199.95 (each). That was fairly expensive for back then and for reference, a Marantz model 2 was $198 each. As you can imagine, they are quite rare. -------------------------------------------- If it is the truth, I will throw my Tall Feet Seven to try it :-)  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 21:44 |
| [#12171] Roger's Williamson Amplifier "2 Mullard EL34, Cossor 53KU (GZ34, 5U4GA), 4 Brimar L-63 (6J5)" --------------------------------------------- I hate myself I could not find my 53KU and 52KU :-)  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 22:00 |
| [#12172] Roger's Williamson Amplifier Congratulations John, beautiful new toys. You have a good eye for perfect pieces. Regards Mario |
nuppieri 正式會員 24.xxx.xxx.227 |
2006-08-05 22:19 |
| [#12173] Roger's Williamson Amplifier You have a good eye for perfect pieces ------------------------------------------- Too bad. They are not mine :-(  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 22:22 |
| [#12174] Roger's Williamson Amplifier Here are some specs: powwer rating 35 watts, feedback 20dB, weight 33 pounds, and price $199.95 (each). That was fairly expensive for back then and for reference, a Marantz model 2 was $198 each. As you can imagine, they are quite rare. ------------------------------------------ I go for Rogers, not Marantz 2 :-) |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 22:24 |
| [#12175] Roger's Williamson Amplifier Gingers, Thanks for the information regarding the Rogers amps. So far it appears to me the pair of Rogers are Williamson type monoblocs with an ultra-linear output stage that uses a pair of EL34 output tubes. This must be an interesting finding to fans of vintage British amps. It will be interesting to compare this pair with Tim's Audiomaster 11A monoblocs (EL34), instead of Alan's Rogers Williamson amps (KT66). |
rcwy 正式會員 221.xxx.xxx.225 |
2006-08-05 23:07 |
| [#12176] Tall Feet Seven EL33 Tim As spoken this Tall feet Seven el33 this afternoon. Any more information regarding this el33? John  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 23:19 |
[#12177] Tall Feet Seven EL33  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 23:21 |
| [#12178] Roger's Williamson Amplifier Yes, this 35W Rogers Eton should indeed be compared with the Audiomaster 11A, Klangfilm KL-V502, Leak TL25A and Telefunken V69 instead. |
timtube 正式會員 218.xxx.xxx.155 |
2006-08-05 23:22 |
| [#12179] Roger's Williamson Amplifier Gingers, What is the code under the "chicken crawl" mark on the Tall Feet Seven KT61? |
timtube 正式會員 218.xxx.xxx.155 |
2006-08-05 23:24 |
| [#12180] el33 What is the code under the "chicken crawl" mark on the Tall Feet Seven KT61? --------------------------------------- CN :-)  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 23:27 |
| [#12181] Roger's Williamson Amplifier Yes, this 35W Rogers Eton should indeed be compared with the Audiomaster 11A, Klangfilm KL-V502, Leak TL25A and Telefunken V69 instead. -------------------------------------- RM's Klangfilm :-)  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-05 23:29 |
| [#12182] Leak Club for Leakies or Leak user My third 12.1 came with a copy manual :-)  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-06 11:21 |
[#12183] Leak Club for Leakies or Leak user  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-06 11:22 |
| [#12184] Leak Club for Leakies or Leak user The real manual used relief printing. A printing processes in which the inked image is on a raised surface.  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-06 11:26 |
[#12185] Leak Club for Leakies or Leak user  |
Gingers 正式會員 221.xxx.xxx.165 |
2006-08-06 11:27 |
| [#12186] Leak Club for Leakies or Leak user Gingers, Alan, Tim & Richard Thanks for giving a chance for me to audition Alan's pair of Rogers Williamson (KT66)yesterday. It is a wonderful experience indeed, Rogers Williamson sounds very good espacially in vocal, relax and emotional !!! BTW I hope we could compare my pair of Dynatron LF59B vs Alan's Rogers Williamson soon. Colin |
xwh 正式會員 219.xxx.xxx.110 |
2006-08-06 14:15 |
