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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old Today, 06:20 PM   #98331
1audio is offline 1audio  United States
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John Curl's Blowtorch preamplifier part II
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Tel made a special instrument for that task. The 130. There is nothing else like it and its long obsolete. It allows measurement of active circuits with a 100 KHz signal or so and has a guard function to isolate elements.
Tek 130 130 - TekWiki
Dratted autocorrect on phones.
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Old Today, 07:03 PM   #98332
jan.didden is online now jan.didden  Europe
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Originally Posted by 1audio View Post
Tek 130 130 - TekWiki
Dratted autocorrect on phones.
... and you have one for sale?;-)

Jan
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Old Today, 07:32 PM   #98333
jan.didden is online now jan.didden  Europe
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Don't bother - I just bought one. Looks new.

Jan
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Old Today, 07:36 PM   #98334
DPH is offline DPH  United States
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Those ain't no smug sunglasses, Jan. New test equipment are the best toys!
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Old Today, 07:44 PM   #98335
john curl is offline john curl  United States
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I would like to talk about something seemingly lost here about what makes for a good audio design.
A great deal of emphasis and energy is put into NUMBERS, or how low the thd can be in a specific design. Is it really that important? What is really audible when listening to differences between amplifiers and preamplifiers? What combination of design compromises gives a historically important design? Can we learn from the past, noting what characteristics are present in world acknowledged extremely successful designs that now probably are collectors items, and almost impossible to get at any reasonable price? For example, the Marantz 9 power amp comes to mind as an early piece that set a listening standard more than 50 years ago. What are its salient characteristics that we should copy in order to make a similar quality solid state power amp? More later.
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Old Today, 07:50 PM   #98336
jan.didden is online now jan.didden  Europe
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Originally Posted by DPH View Post
Those ain't no smug sunglasses, Jan. New test equipment are the best toys!
I know. I have a couple of modern digital scopes, 6.5digit DMMs, that stuff. But also a whole slew of Tek TM500 modules in racks. My very first job, at Philips in Eindhoven, they casually hand me a Tek trolley with a scope (451?), a signal generator and a power supply. I would have worked there for free!

Jan
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Old Today, 07:55 PM   #98337
scottjoplin is offline scottjoplin  Wales
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they casually hand me a Tek trolley with a scope (451?), a signal generator and a power supply. I would have worked there for free!
Jan
You lucky bar steward
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