yagoolar's tube amp projects - Page 3

yagoolar · 13th November 2010, 02:31 PM

Quote:

Originally Posted by tinitus

what does two secondaries mean ?

See attached picture. One can connect primaries and secondaries in series or parallel.

tinitus · 13th November 2010, 02:33 PM

ehh, shouldnt the cap be coupled to other side of cathode resistor, directly to ground ?

are you sure your "opt" is not an interstage, and not an opt ?

yagoolar · 03:04 PM

The xformer is definitely an OPT - 10W does not imply an IT, does it? I have used it before with 6C4C SE - it is air gapped one.

I changed cap connection as you suggested - the same response.

So it is time to make it real.

yagoolar · 13th November 2010, 03:09 PM

See e.g. this amp AFA parafeedcap (value) is concerned:
MagneQuest Transformers: DIY Schematics w/ MagneQuest Iron

tinitus · 13th November 2010, 04:10 PM

Quote:

Originally Posted by yagoolar

See e.g. this amp AFA parafeedcap (value) is concerned:

I suppose the cap is to block DC, thus its cut frequency depends on actual impedance

yagoolar · 13th November 2010, 05:10 PM

Quote:

Originally Posted by tinitus

I suppose the cap is to block DC, thus its cut frequency depends on actual impedance

More on math regarding parafeed, read here: DHTsound

yagoolar · 09:38 PM

I think I reached the optimal schematic. So I start building a prototype.

First approach of a look below

yagoolar · 20th December 2010, 08:26 PM

There is a mistake in supply voltages labels - Eav1 should be 220V and Eav2 should be 360V

yagoolar · 09:49 PM

Quote:

Originally Posted by yagoolar

There is a mistake in supply voltages labels - Eav1 should be 220V and Eav2 should be 360V

Nope, wrong again. Correct values are:
Eav1 (c3g) = Ua triode connected + Ia*Ra = 200V + 15k*13mA = 395V, Uf LED voltage disregarded
Eav2 = Ua +Ia*Rl+ nUf =250V + 62mA*270ohm + 45V = 311,74V -> 310V

yagoolar · 1st October 2012, 07:13 PM

Recent schematic of the amp. Now assembly.

13th November 2010, 02:53 PM	#23
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	OPT The xformer is definitely an OPT - 10W does not imply an IT, does it? I have used it before with 6C4C SE - it is air gapped one. I changed cap connection as you suggested - the same response. So it is time to make it real. Last edited by yagoolar; 13th November 2010 at 03:04 PM.

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13th November 2010, 03:09 PM	#24
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	See e.g. this amp AFA parafeedcap (value) is concerned: MagneQuest Transformers: DIY Schematics w/ MagneQuest Iron

20th December 2010, 08:26 PM	#28
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	There is a mistake in supply voltages labels - Eav1 should be 220V and Eav2 should be 360V