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Old 10th Feb 2014, 1:36 am   #1
kerkalianer
Retired Dormant Member
 
Join Date: Jun 2013
Location: Sao Paulo, Brazil.
Posts: 5
Default Akai 1710 Modifications

Hi

I have one dismantled 1710 and I think it has a good chassis to use like a stereo single ended amplifier.
But, I am going to use it to build a minimalist 2W SE using the Steve Deckert ideas. Here is the link:

http://www.decware.com/newsite/SE84CDIYMONO.pdf

I build one of those and the sound is imbelievable if you have high efficient speakers.
Here a link to see it playing on Youtube:

http://www.youtube.com/watch?v=phuwT7ujL5E

Thanks for the Elektrotanya links.

Abraco.
Walter.

Edit: Split from: https://www.vintage-radio.net/forum/...d.php?t=102369

Last edited by AC/HL; 10th Feb 2014 at 1:58 am. Reason: Thread split
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Old 14th Feb 2014, 8:41 am   #2
k_yller
Pentode
 
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
Default Re: Akai 1710 Modifications

hmmm......something is strange .....
first of all i dont know who wrote the description of this amp circuit but...
el84 are not equal of 6p15p , components in circuit have to be different
EL84->6p14p
6p15p is specific and closer to EL86 (but not equal)
these tubes have different conditions of work
next
IMVHO
6922/6n1p is bit too weak for EL84
next
why power supply has so high voltage ?? IMO at least 80 V too high
next
for EL84 output transformer should have resistance around 5100 ohms on circuit are 9800 ohms
any way probably it will work but it will be far away from excellence
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Old 16th Feb 2014, 5:46 pm   #3
Herald1360
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Location: Leominster, Herefordshire, UK.
Posts: 16,528
Default Re: Akai 1710 Modifications

Hmmmm, can't see anything to rave about in that circuit- it's a bog standard triode driving triode connected pentode amp with no feedback. Only "odd" thing about it is the coupling network between the preamp anode and output grid. You could find something similar in a "quality" 1930s radio, though that would have used something that is ridiculously expensive nowadays for the output valve.

If you think it's good, try a Mullard 3-3 design and compare........
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