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Old 30th April 2011, 04:13 PM   #1
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Default Recommend me a schematic for El34 or KT88 ?

Hello everyone. My name is David. I'd like to start gathering parts for a decent tube amp that I would build during the summer. I'm looking for something that's about 10-15 watts of power that uses EL34 (or KT88) tubes (since they are common in my country), and maybe an ECC series tube (since that's also common here). The power supply should be either solid state or use an EZ81 rectifier tube (since, yet again, they're common here). Sorry, but I am just a beginner (I have just built an ECC82/IRF510 headphone amp). Thanks in advance !
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Old 30th April 2011, 04:55 PM   #2
miklos is offline miklos  Canada
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I assume your amp will be of the push-pull kind for 15W.
The EZ81 might not be enough for that set up.
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Old 30th April 2011, 05:17 PM   #3
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Triode wired PP EL34s will yield the sort of power you're interested in. An EZ81/6CA4 is good for 150 mA., which is not enough for 4X EL34s plus small signal circuitry. SS rectify the B+. I suggest a variation on the "classic" Mullard 5-20 setup, as the topology is reasonably tolerant of budget grade O/P trafos. Put a constant current sink (CCS) in the tail of the LTP, instead of a resistor.
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File Type: jpg Mullard 5-20 Schematic.jpg (380.3 KB, 464 views)
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Old 30th April 2011, 05:37 PM   #4
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These are 25W with KT88 and about 15W with EL34. Also with only 2 stages they are very simple.
OddWatt Audio 5751 SRPP / KT88 Push-Pull Monoblock Tube Amplifier Kits
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Old 30th April 2011, 07:40 PM   #5
Helmuth is offline Helmuth  Netherlands
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This one one is really good performing.
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Automatic Electric Europe
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Old 30th April 2011, 07:49 PM   #6
Helmuth is offline Helmuth  Netherlands
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all tube design.
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Old 30th April 2011, 09:48 PM   #7
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Thanks for all the replies, you guys are great ! Now, I'll just see what parts I can gather and I'll choose one of these schematics
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