drew571 wrote:Hi Joe and forum members,
I'm seriously thinking about building a couple of these kits. Almost done with a pair of LA500's and I'd like to add these to them.
Couple questions on the options while ordering.
What's the difference between the JLM14 and the OEP input transformer?
Also, what are the differences between the op amps. I noticed there are quite a few to choose from.
JLM14 adds a great second harmonic so is great on bass and drums, synths and samples
OEP/VTX adds a more colour and warmth and is great for vocals and acoustic instruments
JLM99v opamp adds real tube like warmth and silky high frequencies
JLM25HV = +/-16v to +/-24v version of 2520
JLM25HVFET = +/-16v to +/-24v version of 2520 but with Fet input stage. (Sounds better to me)
Most popular combos are
1st OEP/VTX + JLM99v + JLM111DC for 60dB version of our Dual99v (Great for vocals and acoustic instruments. Nevish but better low mids)
2nd JLM14 + JLM99v + JLM111DC (great on bass and drums, synths and samples)
JLM14 wires as 1:8 (Red and black instead of red and green) + JLM25HV or FET + JLM111DC (API512 type preamp)
Also remember the variable impedance Z control gives the mic pre a good range of total balance from darker to brighter without using and EQ.