Mac MC240

Thanks Chang. For the Amperex 12au7, do I need the bugle boy or just amperex from USA (or Holland) is good? For the power tubes, I'll stick with my RCA 6L6GC black plate. Did you do the silver cable yourself? Or actually you have some for sale?

Thanks again.

Thanks again Chang. (By the way, are you the Chang of the "Chang" filter?) I'll have a look in my tubes drawer and see whethe rI have the 7316 (most probably not), then I'll take your advise to try the Telef diamond bottom 12au7. Really.....I have tried the RCA bk plate, but with another amp, they didn't sound as you said and I really enjoyed the low. It could be the 240 is "sweet" and "thick" itself and if using the bk plate, it will be toooooo fat and as exactly as what you said. For the 7027A, is it a driect replacement of 6l6gc (plug and play)? I'll look for them.

Thanks again.

Dear friends,
Thanks for all the inputs. I definitely agree with Chang's comment on the clear top RCA 12au7. I have a matched pair. It is good but all depend on which preamp you used. I don't think I have the long plate of the Mullard 12ax7 (or I may, just somewhere in my galaxy!), but I have a short plate.

Two more questions: 1. It is on the position of the power tubes. Say, the one nearest to the front panel (with the knobs and speaker wire screws) is #1 and #4 will be the one near the back. Which pair is for the right channel and which is for the left channel? If I have two matched pair (not matched quad), how should I align them? 2. What is the first 12ax7 (usually with a protection cap) used for? I can see the rest six tubes are for the right and left channels, just not sure what is the 1st one used for.

Thanks again and have a nice weekend.

Thanks Chang.