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6dq6 or 6l6gc se amp?
6dq6 or 6l6gc se amp?
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Old 20th October 2019, 05:15 PM   #1
Cardio75 is offline Cardio75
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Default 6dq6 or 6l6gc se amp?

Hi to all! I am looking for a 15 to 20 w single ended amp. So my doubt is wha tube is the best option? 6dq6b or 6l6gc or another?
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Old 20th October 2019, 06:59 PM   #2
kodabmx is offline kodabmx  Canada
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6dq6 or 6l6gc se amp?
Neither will give you 15-20W SE IMHO. You can get 20W SE out of KT120 though. Possibly EL509, too.
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Old 20th October 2019, 07:02 PM   #3
Eli Duttman is offline Eli Duttman  United States
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Sorry, you're not going to get 15 honest W. out of either type. The 6L6GC is the more capable type and its plate is rated for 30 W. Real world Class "A" efficiency is < 50%.

A full pentode or UL mode KT88 is what you need.
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Old 20th October 2019, 07:27 PM   #4
Cardio75 is offline Cardio75
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Thank you! those valves are out of my reach in money. Another option would be 6146 or 807.
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Old 20th October 2019, 07:43 PM   #5
Ketje is offline Ketje  Belgium
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You could put two 6L6 in parallel.But beware UPT for big power SE are expensive.
Mona
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Old 20th October 2019, 07:45 PM   #6
rsumperl is offline rsumperl  United States
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6dq6 or 6l6gc se amp?
Good Sunday,
I hope this helps.....

Ray
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Old 20th October 2019, 07:49 PM   #7
vinylkid58 is offline vinylkid58  Canada
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6dq6 or 6l6gc se amp?
Quote:
Originally Posted by rsumperl View Post
Good Sunday,
I hope this helps.....
That appears to be a bass guitar amp. So this begs the question, is the OP building a hifi or guitar amp?

jeff
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Old 20th October 2019, 08:14 PM   #8
Cardio75 is offline Cardio75
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Quote:
Originally Posted by vinylkid58 View Post
That appears to be a bass guitar amp. So this begs the question, is the OP building a hifi or guitar amp?

jeff

The initial idea is to make an amplifier like the mathcless spitifire but with more power. the pre circuit would be the same as the original, a 12ax7 with its triodes in parallel and another 12ax7 as a phase inverter. the modification would be in the power. the spitifire uses a pair of el84 in pp, I could use 4 el84 in ppp to get 30w but it would be very expensive for me. Can the spitifire pre handle a pair of 6dq6 in pp?
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Old 20th October 2019, 09:04 PM   #9
kodabmx is offline kodabmx  Canada
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6dq6 or 6l6gc se amp?
You could build this (connected as tetrode with regulated screen voltage) and it'll give you 25W.

Tubes are pretty cheap, too.

6F12P and 6P43P push pull triode amp
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Old 20th October 2019, 09:12 PM   #10
jammer55 is offline jammer55  United States
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Two options,

1. Glass Audio magazine volume 7, number 6, 1995. The 6dq5 single ended power amp. The author got 14w from a single 6dq5 in pentode mode.

Operating conditions were plate supply = 200v, grid bias = -25v, load resistance = 1.6k, plate dissipation = 24w.

2. Adapt the RH amplifier concept for a 6dq5 or parallel 6dq6, 6cd6, or many other sweep tubes.
You can find info here: RH Amplifiers

For more sweep tubes: &quot;Complete&quot; list of sweep tubes
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