6 Feb
2011
6 Feb
'11
7:42 p.m.
I will have to find mine... From what I remember, it's a yellow cover and
titled 'High Quality Sound Reprodcution'. It includes (I think it this
order) the 5-20 (EF86, ECC83, 2*EL34, GZ32), preamp for the 5-20
(3*EF86), FM tuner (I can't remember the full line-up, I am pretty sure
the IF amplifiers are EF41s, the detector an EB91 with an EM80 tuning
indicator), the pre-amps for the 5-10 (EF86) and the 5-10 itself (EF86,
ECC83, 2*EL84, EZ81),
If you could find it and give me details of it, I can start looking. That
would be much appreciated.
There were of coruse other FM tuners for the home
constructor at one
time, Some easier to align than others...
I also have the GEC book on audio amplifiers. The _low power_ one is the
Williamson (15W, 2*KT66 in the output stage). I think the highest power
amplifier schematic in that book gives 1.1kW RMS into the speakers...
*Drool*
Another book I shall have to try and find...
Someday I must get round to building a valve amplifier.
Jonas
7 Feb
7 Feb
3:57 p.m.
New subject: OT: high powered amps
On 2/6/2011 12:42 PM, Jonas Otter wrote:
Try here for the on line version.
http://www.tubebooks.org/
I will have to find mine... From what I remember, it's a yellow cover and
titled 'High Quality Sound Reprodcution'. It includes (I think it this
order) the 5-20 (EF86, ECC83, 2*EL34, GZ32), preamp for the 5-20
(3*EF86), FM tuner (I can't remember the full line-up, I am pretty sure
the IF amplifiers are EF41s, the detector an EB91 with an EM80 tuning
indicator), the pre-amps for the 5-10 (EF86) and the 5-10 itself (EF86,
ECC83, 2*EL84, EZ81),
If you could find it and give me details of it, I can start looking. That
would be much appreciated.
There were of coruse other FM tuners for the home
constructor at one
time, Some easier to align than others...
I also have the GEC book on audio amplifiers. The _low power_ one is the
Williamson (15W, 2*KT66 in the output stage). I think the highest power
amplifier schematic in that book gives 1.1kW RMS into the speakers...
*Drool*
Another book I shall have to try and find...
Someday I must get round to building a valve amplifier. Jonas
Ben.
PS. A GM-70 ( $90 ) might substitute for V1505.
8:27 p.m.
If you could find it and give me details of it, I can
start looking. That
would be much appreciated.
I will keep looking for it, but it's unlikely I'll find it anytime
soon. What I can remembr is the title ('High Quality Sound
Reproduction'), the fact that it was published by Mullard (==Philips, of
course) and it dates from about the time of the introduction of the EL34.
>
> > There were of coruse other FM tuners for the home constructor at one
> > time, Some easier to align than others...
> Someday I must get round to building a valve
amplifier.
I must get round to buildign a secodn Williamson. A friend of mine had
one and wanted to get a stereo pair but he never found a second one. He
gave it to me in exachnage for repairs to his guitar amp. He also gave be
some boxes of 'junk' which incuded a pair of new KT66s, other valves,
valvholders, etc _and the Williamson mains and output transformers. In
other words he'd got the hard to find bits to make his pair... His loss....
-tony
8 Feb
8 Feb
1:20 a.m.
On 2/7/2011 1:27 PM, Tony Duell wrote:
[Mullard Book]
>> There were of coruse other FM
tuners for the home constructor at one
>> time, Some easier to align than others...
> >> I also have the GEC book on
audio amplifiers. The _low power_ one is the
>> Williamson (15W, 2*KT66 in the output stage). I think the highest power
>> amplifier schematic in that book gives 1.1kW RMS into the speakers...
>
> *Drool*
> Another book I shall have to try and find...
No that one I could find.
It's called 'An Approach to Audio Frequency Amplifier Design' and claims
to be 'A Publication of the General Electric Co Ltd of England', datead
1957. It is not a construcitonal book like the Mullard one, there are no
chassis layouts or anthring like that. But there are plenty of
schematics, thory, etc.
Designs include :
A 5W junior amplifier
14W Ultra-Linear amplifier (this is the 912-Plus)
14W DC/AC (mains) amplifier
Williamson
KT88 30W Ultra-Linear amplifier
KT55 25W DC/AC (amins) amplifier
KT88 50W Ultra-Linear amplifier (the '88-50')
KT55 50W Ultra-Linear amplifier
KT88 100W Fixed-bias amplifier
DA42 175W amplifier
DA42 200W amplifier
DA100 115-175W Class AB1 amplifier
DA100 200-270W AB2 amplifier
V1505 300-450W Class AB1 amplifier (this used KT66s in the _driver_ stage)
V1505 600-1100W AB2 amplifier
A couple of pre-amplifers used the Z729 (which iIRC is an EF86)
400W multiple pair amplifier (this has 10 KT88s in parallel push-pull!)
Drool on!
Some good PDF doc's from that era. Happy digging.
http://www.pmillett.com/index.html
Ben.
If you could find it and give me details of it, I
can start looking. That
would be much appreciated.
I will keep looking for it, but it's unlikely I'll find it anytime
soon. What I can remembr is the title ('High Quality Sound
Reproduction'), the fact that it was published by Mullard (==Philips, of
course) and it dates from about the time of the introduction of the EL34.
Someday I must get round to building a valve
amplifier.
I must get round to buildign a secodn Williamson. A friend of mine had
one and wanted to get a stereo pair but he never found a second one. He
gave it to me in exachnage for repairs to his guitar amp. He also gave be
some boxes of 'junk' which incuded a pair of new KT66s, other valves,
valvholders, etc _and the Williamson mains and output transformers. In
other words he'd got the hard to find bits to make his pair... His loss....
-tony 
10 a.m.
On 8 Feb 2011, at 01:20, ben wrote:
On 2/7/2011 1:27 PM, Tony Duell wrote:
>>
>
> [Mullard Book]
>
>> If you could find it and give me details of it, I can start looking. That
>> would be much appreciated.
>
> I will keep looking for it, but it's unlikely I'll find it anytime
> soon. What I can remembr is the title ('High Quality Sound
> Reproduction'), the fact that it was published by Mullard (==Philips, of
> course) and it dates from about the time of the introduction of the EL34.
I put a PDF if the Mullard book on the 'net a couple of years ago. It's long out
of copyright.....do a google for it!
Richard
7:04 p.m.
Some good PDF doc's from that era. Happy digging.
http://www.pmillett.com/index.html
Thanks.. .There looks to be some interesting stuff there, including that
GEC book. Alas the Mullard one isn't there/
-tony
11:09 p.m.
On 2/8/2011 12:04 PM, Tony Duell wrote:
But it is online here.
http://www.r-type.org/static/mull-cir.htm
Some good PDF
doc's from that era. Happy digging.
http://www.pmillett.com/index.html
Thanks.. .There looks to be some interesting stuff there, including that
GEC book. Alas the Mullard one isn't there/ -tony
Ben.
10 Feb
10 Feb
8:01 p.m.
On 2/8/2011 12:04 PM, Tony Duell wrote:
But it is online here.
http://www.r-type.org/static/mull-cir.htm
Is it?
Firstly, I could find several links to download bits of the book, but no
link to download the whole thing and I don't think all sections are
available to download separately. I couldn't find the series-heater-chain
AC/DC mains amplidier or the tape amplifier for example.
Secondly, this is not the book we are talkign about. This is the second
one that the OP already has. For the <nth> time, there is an earlier
book, with only 2 main amplifiers (5-10 and 5-20), their preamps and an
FM tuner/. No tape amplifier, no 3-3, etc. And the FM tuner was removed
Some good
PDF doc's from that era. Happy digging.
http://www.pmillett.com/index.html
Thanks.. .There looks to be some interesting stuff there, including that
GEC book. Alas the Mullard one isn't there/ from the later book which is why the OP wants to find
the older one I
believe.
-tony
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