DOWNLOAD: Tube_Mix_It_Box_1960
Anyhow. This mixer has some interesting features; nice simple circuit for calibration pot for DB meter; the best part though is the output stage: a 6AK6 tube is used into a 10k ohm load and promises a .8 watt output. I am not aware of any other hi-fi line output stages with 6AK6s; def want to try it. .8 watts output would very welcome in many of my builds… can’t get enough of that clean headroom…
Here’s the schematic (included in the download as well).
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Might the S-15 (12W PP) output transformer specified in this schematic be a typo? I would think that the correct UTC would be S-14 (single ended). If this is not a typo, I'm thinking of doing something similar to this with a UTC S-16 I have (30W PP) by running the DC through the whole 10K primary. What is your call on this? What might be the reason for specifying a S-15 instead of S-14?
Cheers
Hi chris. some of those 'universal' UTC O/Ps could handle DC on the primary. I don't know for sure which ones. but its risky. and their frequency response sucks anyways. if i was gonna build this, i'd use a utc A25. good luck. c.
I'm trying to find schematics for a 60's lang portable mixer and equilizer.
I just happen to have a s-14, and a 0-1. I just may give this a try. I did a sweep on the s-14 with no load and it didn't look so hot. Might just get replaced. What I should do is sell the s-14 and use those big bucks for more and better iron.lol
The tabs on the OT bottom in the picture do not match the s-14. So perhaps they did us a s-15. Odd as the circuit is single ended. Have you tried this yourself yet?