ruffrecords
Well-known member
I am down to the last two REDD EQ PCBs. If it looks like there is a demand I will order another batch.
Cheers
Ian
Cheers
Ian
ruffrecords said:The Neutrik specifications are confusing to say the least. It says "NTL1 is a line transformer intended to balance amplifier outputs for line driving up to +24 dBm". The it says it can drive 6V rms into 600 ohms at 30Hz which is just over 17dBu. The strange thing is the primary inductance is a whopping 150 Henries and the primary dc resistance is 100 ohms. YThis says to me that this is really intended as a 10K:10K line input transformer.
goetzmd said:Thanks, Ian! The Edcor looks good. I'm slowly getting the basic parts. I'll build your boards first and go from there…
Cheers,
Goetz
ruffrecords said:I just found these little gems:
http://www.triadmagnetics.com/catalog_template.php?productCategoryId=47
They are available from Farnell. I just bought some of the 10K:10K 0.1W types for use in a VU meter buffer. When I tested them their primary inductance was over 30 Henries at 100Hz and their response was just 0.5dB down at 20Hz. 1KHz distortion at +18dBu was just 0.05%. And the are really small.
For your application the 600:600 one might be more appropriate:
http://uk.farnell.com/triad-magnetics/ty-145p/transformer-audio-0-1w/dp/1610411
Cheers
Ian
letterbeacon said:It's more than likely me misunderstanding the specs, but don't they only go down to 200Hz?
Sleeper said:Ian, I sent you some pics directly. Hope you got them.
Here's one for your listeners ;D
2 channels of Ruff Helios EQ mastering version all stepped controls.
Solid State Pultec output circuit- 2520 opamp with a quadfilar transformer.
Run a few mixes with it.
Beautiful
Recycled rack case - decals mounted on 12 gauge aluminium front panel.
good enuf.
Thanks for the great project.
Kelly
Rocinante said:So I'm probably doing a stepped gain switch using 1 pole 12 pos lorlins in place of the pots and using grayhills like they were intended and was wondering if the non-shorting type were okay to use? Its all they have at digikey and I am trying to somewhat consolidate my purchases (and yes I know capi carries them).
I was also hoping on using edcor 10k/10k in and the 600/600 ohm output xfmrs and would like to hear some opinions on how they are since they seem to get mixed reviews. Maybe sowter in and edcor out or vice versa?
And finally concerning inductors are there single inductor alternatives to the Carnhill vtb 9042 and 9043?
If the carhill inductors are a necessary component for the helios 'sound' id rather not diminish anything and will just suck it up but if I could save a buck or two that would be pretty helpful.
Rocinante said:One last inquiry (for awhile anyway);
Do you (or anyone) see any problems using Carnhills vtb 2281?
The specs seem right.
Might as well
btw happy xmas everyone.
ruffrecords said:Yes. The Helios is unique for one of my EQs in that the bypass switch is built in - I literally copied it from the original - so you do not need the DPDT bypass used in the poor man's EQP1A. You can just go straight into In and IG (ground) from the Helios EQ out. You do not need to fit VR2 either or the 470 and 10K resistors next to it.
Cheers
Ian
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