Hello,
I am no expert in tubes at all and have an amplifier built from the kit purchased on Aliexpress:
https://nl.aliexpress.com/item/1005...3Lcnrian&utparam-url=scene:search|query_from:
I have a pair of 300B EH tubes which I would like to use so I am thinking to repurpose the chassis and power supply for new build.
The goal is decent amplifier, not crazy hi-end stuff, let's be realistic here. So my main question is what would be the way to go: can I reuse the output transformers? What to choose as the first stage?
I am no expert in tubes at all and have an amplifier built from the kit purchased on Aliexpress:
https://nl.aliexpress.com/item/1005...3Lcnrian&utparam-url=scene:search|query_from:
I have a pair of 300B EH tubes which I would like to use so I am thinking to repurpose the chassis and power supply for new build.
The goal is decent amplifier, not crazy hi-end stuff, let's be realistic here. So my main question is what would be the way to go: can I reuse the output transformers? What to choose as the first stage?
You could, but that would be it. They aren't good quality transformers, which is what you want for a 300b amp.
The power supply would be useless for a 300b amp. For starters, you need a dedicated 5v filament supply for the output tubes, as they are directly heated (DHT). You're much better off buying a kit, and leaving your EL34 amp intact. Just my 2 cents.
jeff
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They also sell a 300B version of the EL34 kit: same chassis and output transformers, 6SN7 driver tubes, and a different, larger power transformer with higher HT. The chassis output tube holes are enlarged to fit the 300B sockets. So the conversion is possible, but probably not worth it.
Do yourself a favour, and build something like the tubelab TSEII - you'll get lots of support here, a BoM from Mouser etc, and most importantly of all, proven good sound. The downside of course is that you need to make/buy your own chassis....
It will cost more, but it will sound good and you'll enjoy it for ever whereas with the cheaper one from Ali you'll be disappointed once the initial flush wears off.
Buy once, cry once.
It will cost more, but it will sound good and you'll enjoy it for ever whereas with the cheaper one from Ali you'll be disappointed once the initial flush wears off.
Buy once, cry once.
Build this amp with the EL34s if you need to see how an amp goes together, but don't try to fool yourself into believing there's a good 300b amp hiding in there. I know it's hard to wrap your head around the idea, but a good SE amp has well over $1,000 of parts in it. High Quality output transformers, good, expensive caps, nice components, and a good non-magnetic chassis; they add up.
also, 300b has directly-heated cathodes, so you'll need 2 separate power supplies for the output tubes. no room for that in this little chassis.
w
also, 300b has directly-heated cathodes, so you'll need 2 separate power supplies for the output tubes. no room for that in this little chassis.
w
