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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 16 Nov 2018, 03:31

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PostPosted: 25 Jun 2018, 17:20 
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Joined: 25 Jun 2018, 17:04
Posts: 1
Hi, I'm new to the whole tube amp thing and would like to ask whether this amp would be powerful enough to drive a couple of bookshelf speakers from the mid 80's, I hope this isn't a stupid question :)
Oh, and as a small, possibly even more stupid question; why do almost all tube amps need output transformers? I'm not used to audio electronics, especially not anything above 24V like most tube amps are...


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PostPosted: 28 Aug 2018, 05:21 
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Joined: 14 Aug 2018, 06:13
Posts: 1
Hi all,
I also built this amp using a pcb I found on e-Bay. PSU is regulated 12.6V with a LM317 followed by a TPS7a4700. Sounds great - better than expected and I'm happy. :)

To answer the questions: This amp with B+ at 12V by my calculation (which may be wrong) produces 0.5W max. This means that if you have pretty sensitive speakers (let's say 90dB/W/m), this amp can drive them at 45dB level (0.5*90=45). In real life in the evening when everything gets peaceful and quiet, you could probably try it and play at easy-listening level. Now I'll have to try it to see how it works.


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PostPosted: 11 Oct 2018, 22:31 
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Joined: 30 Sep 2018, 10:19
Posts: 1
So I decided to built this amp the other day and I really liked the sound. Yesterday I built a little plinth for it and and decided to use a 24v 2.4A regulated power supply I had laying around. I wanted the look of 2 tubes so I used a triode from each tube and ran the heaters in series. Everything else is per the original schematic with 2.2uf metalized poly film on the input. simple point to point wiring. I've been listening to it as a line level to my HiFi system. No noise, soft highs, I'm really surprised at how good it sounds.


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PostPosted: 15 Oct 2018, 19:49 
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Joined: 23 Feb 2017, 02:02
Posts: 224
That looks very sexy I like


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