Re: Peavey 6505 Mini
Actually not necessarily.. most people dont know that you can use one side of an EL84 as a phase inverter which would save them one 12ax7. Then im guessing that the effects loop is no longer tube driven and you have the other. Even then in the 6505 there is one 12ax7 that only one side is actually used so its quite possible they are making up for the missing 2 without op amps... but that being said i wouldnt be suprised at all if they did use them.
Just FYI, the PI section uses both sides of the preamp tube, so it uses a whole 12AX7, although I'm guessing they are using a SS PI in these amps, just makes more sense. Also, power tubes are not split into 2 separate circuits like most preamp tubes, they are a single circuit (there may be some power tubes with 2 circuits out there, but the 6L6s, 6V6s, EL84s, EL34s, 6550s, etc... that are used in guitar amps are single sided).
I personally like the low power amps, although I would like to see more 6V6 amps instead of just EL84 ones. Back in the day when I was playing clubs, even some of the bigger clubs, I had a 50W and 100W Marshall (JCM 800 or 900, and sometimes an old SL) half stack, even with the 50 watters the house sound guys usually just kept telling us to turn down so they could control the mix, it was usually down to a volume that was below the "good tone" setting. So, I welcome these, you can get the power tubes working at a reasonable volume through a 1-12 or 2-12 and still let the sound man control the mix. If you only occasionally need more power and multiple cabinets, you can always slave out to a separate higher wattage power amp powering a couple of 4-12s or something. Heck, I run direct most of the time now, so my "amp" is an AMT SS-11, if I want to run cabinets, I have an ISP Stealth power amp. Granted, amps have come a long way, and master volumes do a better job of letting 100W amps sound decent at lower at lower volumes, but when you run a tube power amp at low volumes like that, it's running as clean as a SS power amp, so all those high $ power tubes aren't really contributing to your sound.
Mostly just my <$0.02 (except for the power tube specs) so YMMV, it's all ice cream, etc...
*EDIT* And yes, I'm waiting on that Jet City SDOTD to come back around, I missed it...