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Hello, I completed the "two in one" mods a few months ago and have been using both the ef86 pre and the 12ax7 mic pre with wonderful results. (Thanks for all the helpful articles and schematics, Rod!) I am interested in using these amps as a stereo hi-fi too. Does anyone have any suggestions on mods...

I purchased this ATR off ebay earlier this year. It has some peculiar modifications and so perhaps someone has some suggestions about what to do with the machine. 1. The ATR has an added switch labeled internal and external. When switched to external, a motor starts and the reels speed up. (though I...

thanks for the posts I ll look into the dc resistance.... I hooked them up "trial and error" style until the ground hum and signal cancellations were solved.... i need to investigate a little more. On the "ef86 pre" I think I had some high end clipping.... didn't sound bad, just looked funny in the ...

I bought these xfmrs pretty cheap and and am wondering if anyone knows what they are/ has data sheets available. One person on ebay is selling them as "beyer 71107 A", but beyer themselves said they were unaware of this xfmr "71107 A". I am currently using them as mic input transformers for a "Rober...