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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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PostPosted: 06 Apr 2012, 00:23 
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Joined: 29 Jun 2011, 12:55
Posts: 5
Hi everyone
ım new at the forum,and this is my first topic here.
a couple months ago ı started to pay attention fisher amplifiers,and ı had few philips miniwatt el84,and thinking to my self wich amp ı had to do,which is the simple,precious.
as a result ı decided to make fisher x100a,first sight x100 seem so complicated as a service manuel,but ı made it simple and more efficiency,
x100a is a cathod biased amp,99 percent of the el84 configuration is cathod biased,but that never mean it is made negative biased,negative biased amp give u a exact bias point for each tube in the amp and there are no resistors in watt,no potentiometer such as 5w-10w.You just need about -20v supply.

x100a have 11 tubes,pre-amp-phono pre amp,tone control and looks so complicated.Thats why ı remove many of these stage,ı did it just with voltage amplifier,phase siplitter and power output.
to be seen tidy ı made a pcb for it,looks good enough
in my test it looks so good,mid and treble perfect ı can say,its something to behold pay attention,but ım keeping to improve,and ı just say if u want to give me advice plese do it,maybe its grove a litlle bit more.

Image
Attachment:
x100a.jpg

ıll keep in touch
thank you all inadvance.


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PostPosted: 08 Apr 2012, 06:58 
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Joined: 29 Jun 2011, 12:55
Posts: 5
ım keeping to do amp,its going smal steps,here is some design picture

Image
Image


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PostPosted: 12 May 2012, 10:55 
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Joined: 29 Jun 2011, 12:55
Posts: 5
hi everyone
at the end ı have finished my Fisher X100A amp,
ım really satisfied with this amp,perfect


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PostPosted: 12 May 2012, 11:24 
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Joined: 05 Nov 2010, 21:07
Posts: 702
Location: South East US - Tennessee
:thumbsup: Nice job!

_________________
The key to a successful build is to keep the smoke IN the circuit.
-Les

We cannot solve our problems with the same thinking we used when we created them. - Albert Einstien
_________________________________
LM380 Bridged Guitar Amp, Oatley K301 Phono Pre-amp, Oatley K272 Headphone Amp, Tube proto-board


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PostPosted: 13 May 2012, 01:29 
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Joined: 29 Jun 2011, 12:55
Posts: 5
thank u Les
in couple of times ı will put the technical mesaurements.By the way ı used the obligato coupling capacitors,they are perfect
here are some new photos


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PostPosted: 15 May 2012, 16:31 
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Joined: 29 Jun 2011, 12:55
Posts: 5
Here is some measurements about Fisher

measurements is on 4ohm

Power output : 17w
Voltage gain 28.5dB
input sensitivity 290mv
bandwidth 35-20500 Hz


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