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punchy fat bastard chip
roger foote suggested this
HPFing and LPFing
Frequency range of TK-1 is 50 - 10000 Hz +/-0.5dB and maximum operation level is 10dBm
Frequency range of TD-1 is 30 ~ 20000 Hz +/-0.2dB and maximum operation level is 13dBm
If you've got the iron already
his would require a 4P5T rotary switch. The WF-30 will give you 5 different impedance configurations
If you're interested in using the 4P5T switch let me know and I'll post a diagram of the wiring for it.
I'm not 100% the WF-30 uses the same pin outs as the A-20
one of the most badly drawn diagrams
Quote from: outoftune on March 04, 2009, 11:44:24 PMroger foote suggested thisMain Board:Replaced 4-NE5532 with OP275Replaced 2-TL072 with OPA2604Replaced 2-TL074 with TLE2074 (probably not needed)Rear I/O Board:Replaced 2-TL072 with OPA2604Replaced 6-10 uf @50V electrolytics with Panasonic FC 22uf @ 63VReplaced 8-300 Ohm 5% Carbon film resistors with 200 Ohm 1% Metal film(The caps are marked C35,C38,C41,C56,C58 AND C63)