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Tim Williams SE OTL amplifier questions
Tim Williams SE OTL amplifier questions
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Old 16th January 2019, 11:23 AM   #1
Tyimo is offline Tyimo  Hungary
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Default Tim Williams SE OTL amplifier questions

Hi!

Is it possible to modificate the original Parallel Cathode Follower 6DK6 OTL amp to use 6C33C tube?

Greets:
Tyimo
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Old 16th January 2019, 11:58 AM   #2
ErikdeBest is offline ErikdeBest  Switzerland
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Yes!
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Old 16th January 2019, 03:19 PM   #3
jhstewart9 is offline jhstewart9  Canada
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I recall that cct. And Tim, a teenager. He was very active on RAT, studying at home. Don't recall he ever built it. Tim often posted his brain storms, many of them not practical.


Don't know what he is doing now.
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Old 16th January 2019, 03:58 PM   #4
ErikdeBest is offline ErikdeBest  Switzerland
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There is not much one can do wrong in such a CF design.
- provide enough clean gain. The 6C33C will have a gain of about 1/2 in CF, so for 1W in 8ohms (2,83VRMS), the driver will have to provide at least 2x2.83VRMS, say 6VRMS.
- provide enough current in the output stage. Pure class A, so the 200mA (based on the choke figure) of standing current can only swing between 0 and 400mA. Output power with 200mA is about 8ohm * 0.2 * 0.2 = 320mW. So, more 6C33Cs and a bigger choke!
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Old 16th January 2019, 06:41 PM   #5
dhaen is offline dhaen  Europe
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Didn't Tim post here as Sch3mat1c? or is my memory failing me?
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Old 17th January 2019, 03:00 AM   #6
jhstewart9 is offline jhstewart9  Canada
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Checked Tim's handle on the search button. He was here but the last post was a few years ago. Perhaps he has a real job!
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Old 17th January 2019, 05:58 AM   #7
TonyTecson is offline TonyTecson  Philippines
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Tim Williams SE OTL amplifier questions
the 6080. can also be used.....otoh, the 6DK6 is still a dollar a pop at Stan's ...Summer Dollar Days - Vacuum Tube Sale - $1.00 Vacuum Tubes
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Old 17th January 2019, 12:31 PM   #8
Tyimo is offline Tyimo  Hungary
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Quote:
Originally Posted by ErikdeBest View Post
There is not much one can do wrong in such a CF design.
- provide enough clean gain. The 6C33C will have a gain of about 1/2 in CF, so for 1W in 8ohms (2,83VRMS), the driver will have to provide at least 2x2.83VRMS, say 6VRMS.
- provide enough current in the output stage. Pure class A, so the 200mA (based on the choke figure) of standing current can only swing between 0 and 400mA. Output power with 200mA is about 8ohm * 0.2 * 0.2 = 320mW. So, more 6C33Cs and a bigger choke!
So it is only usable for headphones and high Ohmic speakers.
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Old 17th January 2019, 03:12 PM   #9
jhstewart9 is offline jhstewart9  Canada
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Any loadline steeper than 2 rp creates much distortion.
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