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Boyuu EL34 A9 Tube Amp
Boyuu EL34 A9 Tube Amp
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Old 24th November 2020, 08:16 PM   #1371
gerrittube is offline gerrittube  Netherlands
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Join Date: Jan 2018
Location: Holten
How about the Takman 330k’s? I’m getting confused.

Regards, Gerrit
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Old 24th November 2020, 08:57 PM   #1372
chriskim is offline chriskim  United Kingdom
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Join Date: Apr 2013
Location: virginia water surrey
think were both confused now !! so the grey unbranded ones but i suspect fake in their values was supposed to be 200k 2w - the new pink Takmans are 330k 1w - and they are almost cool to touch , Takman rate their 1w resistors to run at something like 5-600w - physically they are big as 2-3w resistors - i know some people just dont worry about cheap stuff but i always buy good quality - as in the case of me risking buying the grey200k's from ebay - look where that ended up !! normally i use hifi collective because i trust their products - Takmans are about 1.00 each - ebay pack of 10 rubbish 1.50 -- NEVER AGAIN !!
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Old 27th November 2020, 09:08 PM   #1373
gerrittube is offline gerrittube  Netherlands
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Right, I have used some Taskman’s too and they are very solid and have very rigid wires, perfect for my needs (including point-to-point wiring). I’ll never buy these on ebay/aliexpress.

Regards, Gerrit
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Old 27th November 2020, 11:34 PM   #1374
chriskim is offline chriskim  United Kingdom
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Join Date: Apr 2013
Location: virginia water surrey
Default Takmans

they are well worth the extra spend - all the other resistors in there are Amtrans - again superb quality and fair pricepoint ---
so my boyuu is still behaving well - very well in fact , at the technicians on Wednesday it had really good traces on the scope - sorry i cant tell you the technical stuff -- thats why i was there !! -- we found it was making about 9w running very cool and under voltages - about 2% distortion at absolute max full gain -- we helped this a little by changing the 500ohm resistance - so now rather than the pair of 1k (500ohm) we removed one on each channel - replaced with a 680r -- that has now given 404ohm resistance - i could see a big difference on the scope - really cleaned up the distortion -- no more can be got from this amp as simply the opt are rubbish !!! -- i might change them for better but now looking at building a pair of kt66-6l6gc pp monoblocks - hoping for about 30w+ -- so will probably leave the boyuu and put my money towards the new scratch build --- my boyuu is powering Klipsch R51-m spkrs -- about 92db sens -- so it does go pretty loud !! - above all its very well behaved -
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Old 1st December 2020, 01:00 PM   #1375
Tubby23 is offline Tubby23  United Kingdom
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Join Date: May 2020
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Has anyone got the specs for the stock power transformer?
Or the model?
I'm particular interested in mA capacity.
__________________
What Hi-fi?!
I can only hear up to 13K!
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Old 1st December 2020, 01:18 PM   #1376
chriskim is offline chriskim  United Kingdom
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I've found nothing in the way of specs for these its pretty poor that the supplier doesn't give it
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Old 1st December 2020, 02:44 PM   #1377
DavidN is offline DavidN  United Kingdom
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Quote:
Originally Posted by Tubby23 View Post
Has anyone got the specs for the stock power transformer? ...I'm particular interested in mA capacity.
Spec is quite clear from the circuit diagram. Secondaries are:
5v @ 4A
6.3v @ 3.5A
6.3v @ 1A
315-0-315v [the choke is labelled 200mA, so that's a guide]

...and weighs 3.33Kg

Last edited by DavidN; 1st December 2020 at 02:48 PM.
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Old 1st December 2020, 09:59 PM   #1378
chriskim is offline chriskim  United Kingdom
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lol
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Old 4th December 2020, 07:26 AM   #1379
Tubby23 is offline Tubby23  United Kingdom
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Join Date: May 2020
Location: London
Quote:
Originally Posted by DavidN View Post
Spec is quite clear from the circuit diagram. Secondaries are:
5v @ 4A
6.3v @ 3.5A
6.3v @ 1A
315-0-315v [the choke is labelled 200mA, so that's a guide]

...and weighs 3.33Kg
Thanks!
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What Hi-fi?!
I can only hear up to 13K!
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Old 20th December 2020, 11:11 PM   #1380
Brave Dons is offline Brave Dons
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Join Date: Apr 2020
Hi I think one of my 6N9PJ valves has gone bad. Can anyone recommend an equivalent replacement?
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