[quote name='davehux' timestamp='1380019724' post='2219515']
The CTM30 has 1 x ECC83 and 1 x ECC82, whereas the LB30 has/had 2 x ECC83 and 1 x ECC82. The both have the 4 x EL84 power valves.
Many LB30 owners (including me) found that it broke up too soon with the ECC83's, and by swapping them for 81's, you got about 25% more volume before the grind kicked in. There are a few threads on here about it.
The TB500 will run to stupid o'clock on the volume dial with as much or little gain as you want to give it.
Pricewise on here, there's not much difference £350-£400 depending on if the LB is one of the original 50 UK ones, or a Chinese built model
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So the valve combinations are very similar but subtly different, presumably the sound is slightly different too...s/h is going to be king of course so keeping my eyes open for an LB30 will be probably be the thing!
The kind of sound I'm after will have a slight break to it but that'd be running at reasonable volume, I'd not want it to go into full grittyness, just that slight breaky warmness!