Amplifier class A EL34 - diyAudio
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Old 15th June 2015, 07:43 PM   #1
audio3 is offline audio3  Italy
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Join Date: May 2011
Default Amplifier class A EL34

Greetings to all sailors!
I have a question to ask you, I was asked to buy this amp, in your opinion is valid and how it may be used.
Thank you in advance.
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Old 15th June 2015, 10:02 PM   #2
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azazello's Avatar
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Location: Bulgaria
According this schematic, EL 34 works with about 250-260 V, that is low for it. /On the cathode about 30 V. U plate-cathode is about 260 V/. Good sound it gives with 300-400V, IMO. This schem. will work good with tube 6P3S-E....
What costs this SE?
Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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Old 16th June 2015, 06:11 AM   #3
audio3 is offline audio3  Italy
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Thanks for the reply Azazello, the owner asks 400. He says it was built by an artisan, but my doubt is that it is one of the many amplifiers made in china, as there are many pictures on the internet of this item.
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Old 16th June 2015, 08:58 AM   #4
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Join Date: Feb 2010
Location: Helsinki
Are you buying to use it as it is, or to DIY experiment with and perhaps improve?

There's a lot of room for improvement there. But it looks nice and is already put together, with ok looking parts. So 400€ might not be unreasonable, if you plan to improve it. If not, I would definitely not pay that much (any money) for that circuit, no matter how nicely put together.
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Old 16th June 2015, 09:11 AM   #5
DF96 is offline DF96  England
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It is basically a higher power version of a 1950s wireless set audio stages. The SRPP first stage won't do anything much different from a normal grounded cathode stage, and the output is just a pentode with no feedback. It even has a valve rectifier, just like an old radio. If you like highish distortion and boomy bass then this is the amp to buy. Lots of 'tube sound'!
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Old 16th June 2015, 09:22 AM   #6
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Location: In Transient
It looks like a cheap Chinese amplifier kit, €400?! more like RMB400.
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Old 16th June 2015, 12:35 PM   #7
audio3 is offline audio3  Italy
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I would purchase it such as, to drive the full range. I like medium high very clean, down really care less. What do you think? should be directed on the other? Thanks
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Old 16th June 2015, 01:09 PM   #8
Koonw is online now Koonw  Malaysia
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All tubes are Chinese , they are quite reliable except the rectifier may be not as sturdy compared with others. The output tube is -B version which is good, but it should include a safety fuse say 150mA to protect the OPT in case short circuit in the output tube else it will cause you more. You can also try Russian 6H9C usually sound even better than Chinese tube in my experience. For that price you should bargain a little..
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