dustbro
Well-known member
Any recommendations to add a quick DI to this circuit?
thanks in advance!
Dan
thanks in advance!
Dan
Bill Wilson said:For the input transformer a UTC A-10 would do very nicely. It has a winding ratio of 1 to 10 & has the necessary taps on the primary. The secondary impedance is 50k ohms & will take +15dbm before the core saturates. The freq response is down only 1 db @ 30cps & .5db @ 20kcps,
(oop's hertz), forgive me but I cut my teeth on tubes back in 52.
The A-10 will work for the 1008 & 1108 as they are to single grid & single FET; it will not work for 1016 as it is a balanced circuit configuration & requires a split primary. A UTC HA-114 will work well as the output xfmr. for the 1016, it is 30k ohms split primary w multiple secondaries covering all the pro output impedances & will handle +23dbm. It is perfect for a 12AY7/6072 in push pull. Freq. response -1db 30hz to 40khz. Input trafo. for 1016 would be a UTC A-12, it has split windings on the secondary for push pull.
Have not take the time to look @ 1108 in detail so cannot give you anything but a guess on the output trafo's impedance but could be around 600 ohms.
I can guarantee the frequency response of the A-10 as I used them in a 6 input 3 channel mike muxer in 64; when I was doing on location mastering for a couple of small rcord co's.
Hope this helps.
Bill W.
P.S.: the dbm figures on the transformers are for the 600 ohm impedance.
isophase said:Hi all,
i'm using a 1Meg Log pot for the gain control as suggested here, but when the pot reaches 12 o clock position, it seems the unit has already reached maximum gain and between 12 o clock and fully CW nothing happens, no gain increase.
whats the best way to do it?
ln76d said:1M is ok = look at the schematic of original, there was a version with handwritng. There you have showned what should be resistors for fixed gain setup. Mnats schematic shows full gain resistor value. If you will go lower then you will be able to set proper levels with 1M pot.
coledingo said:I've been studying dmp's build but dont have the 24v option. I don't think..
coledingo said:Also, dwould the mnats variable voltage 48 psu help me, and any chance it would fit in the 500 slot?
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