you bought it! You can't put 34s or 77s in there it'll blow up... and also the el84 tube sockets are small noval sockets you would have to remove them and drill for octal sockets toaccomodate 34s, easier just to buy their 50 watt amp man

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you're not getting much more than 20 watts outta this without a heavy modification, I wouldn't trust a Chinese output transformer to handle more than what tis designed to. If tis rated for 20 watts you're lucky to get that. If you want a firmer sound you could convert the EL84/6BQ5 tubes to 6973 tubes. This was a tube used inc ar radios starting in the alte 50s, tis a replacement for the ubiquitous 6V6 beam tetrode and sounds similar even though its in a small EL84 bottle. Unlike the 6AQ5 though tis not precisely a small envelope 6V6, its beefed up for long life and can handle higher palte voltages and can dissipate a few ectra watts epr plate. Supro used it and is using it again now that tis been reissued by some tube companies. SUpro ran it really gently but in your amp it can be biased up to have a big round deluxe reverb type of sound and headroom.

a no-mod solution for a somewhat bigger more American sound from your jet city is to switch current production tubes to the TAD brand STR EL84 which is the most 6V6-like current production EL84....for super long tube life at extreme bais conditions (you can make it hotter for more headroom and juicier cleans) you can try the old military spec Russian tubes, they're incredibly robust and sound good with strong clean headroom watt for watt... if you want to get some power amp distortion try the JJ low power EL84 which ahs way les headroom and will allow you to get the clean channel of this amp to break up at a more reasonable level, and the dirt channel will easily be able to clip the power amp, va va voom! I can also mod the amp for you for a small fee if you want.

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honestly, at some pint you should mail it to me and have me take the tube sockets, jacks and pots off board for durability and I'll then make any mods you want from there. Since tis the channel switch I can't do my classic post-phase inverter master mod on here, which is a shame because ona single channel 800 circuit like this it gets a bt more of a hot rod plexi tone and more controllable volume

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its eventually.... if tis new or close to it you have a while before you need to worry about PCB heat-resistance