J&H is a great pedal for running into the clean channel or low-input section of a good amp.
Classic 30 isnt/never was intended to be, a high-gain metal amp. Isnt going to happen naturally-ie: via it's lead channel's tubes alone.
If that's the sound you are after-Hi-gain from a small amp,you should look hard at an old Laney AOR 3012. Great little combo that will get you into the hi-gain/heavy tones WITHOUT any pedal sillyness in front of it. And you can find em cheap on ebay every couple of weeks. Usually $200-ballpark,if not less.
BUT even that amp is going to be loud without an attenuator. Low watts doesnt always mean low volume,when we're talking about tube amps.
Which makes me wonder-why do folks insist on getting tube amps-especially hi-gain ones-when they only intend to:
a) shove an IC-chip based distortion box in front it
b) hope to play at "bedroom" levels :tard: ...sigh..
I can see the point of B, IF they plan to do some gigging/recording/etc sometimes,then come home and use the same amp.But...
Ideally,for the 90% bedroom players,you might as well just get one of the little SS Vox/Roland/Line6 amps or pods- get the tones you are seeking,at the volume levels you can make use of at home-and STILL have the option of recording with them, and/or running them through PA systems or power-amps.
That said though, I do use one trick with my 100 watt head when I want to play it at home (only amp I use now,anyway so..) at "bedroom" levels.
It's the only time I put any pedals other than a wah in front of my amp.
On my Laney, when you plug into the low-input, it by-passes the 1st pre-amp tube completely. Goes right past the 1st pre-gain stage. Makes for great Bassman-like clean tones,too..but-for low volume playing...
I run the gtr through an old Zoom 505 pedal,then to the amp.
Ive made some patches for it, that use just a little Overdrive,a good bit of gain, a touch of compression,then tweak it's eq a bit-and the patches very closely mimic the tone of the AOR when plugged in through the Hi input.
What i then do, is adjust the PEDAL's output level to what I want.
Hence, I can crank the pre-gain on the head,and even the Master I can run quiet high (thus getting the power tubes cooking too) but the overall volume coming from the speakers is determined by how high or low I set the pedal's output.
With this set up,I can play "bedroom" level,and still get the tones I usually use at higher volumes. And bada-bing! Best of both worlds. 100watt head for when gigs or recordings are going on-same head for when I play quiet enough that people can sleep in the same room and not know Im playing-and no attenuator needed. :headbang1:
But for those who deliberately seek to use stomp boxes for thier sound, I say leave the high-wattage/hi-gain amps to others-just get a good,clean amp that will faithfully amplify the tones u like from your boxes,and use that. Because all that gain and wattage-and cost-is just a complete waste to you,if the bulk of your tone is derived from a pedal. Once that IC chip enters the circuit, it taints the signal, and what you are hearing from then on is the pedal-NOT the amp. Yes, the amp may impart some sounds of it's own to an extent,and the tubes may react somewhat-but the bulk of the tone is STILL the pedal.