In article ,
Phil Allison wrote:
Perhaps you might ponder on why Bose would make speakers specifically
for PA etc use



** In fact just a simple modification to the existing 901 model.

Right. So we can add the Bose speakers I'm talking about to the amp you
haven't seen either.

And if you haven't seen something in your tiny country it doesn't exist.

--
*If one synchronized swimmer drowns, do the rest have to drown too?

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
Phil Allison wrote:
** In the early 70s, the only PA product Bose sold was the model 800
speaker.

Very wrong. Again. The units mentioned are 802.

--
*Remember: First you pillage, then you burn.

Dave Plowman London SW
To e-mail, change noise into sound.

Dave Plowman Criminal Psychopath & Pommy **** wrote:

-----------------------------------------------------



** In the early 70s, the only PA product Bose sold was the model 800
speaker.


Very wrong. Again. The units mentioned are 802.



** The Bose 802 speaker came much later, a totally plastic box with plastic frame woofers with twin,front ports - absolutely no wood or vinyl as YOU described - which *were* features of the 800 model

So Plowman is a LYING **** and continues to make **** up cos he has no facts.


FYI:


David Plowman ( typical pommy, geriatric scumbag ) is a festering, vile, autistic and schizophrenic pile human garbage that really should have been aborted at the earliest possible age.

And his remains fed to pigs.

And the pigs would have puked.


---------------------------------


Think I am way over the top exaggerating ??

Not one tiny, little bit.





..... Phil

On Fri, 21 Jul 2017 05:12:19 -0700 (PDT), Phil Allison
wrote:

Dave Plowman Criminal Psychopath & Pommy **** wrote:

-----------------------------------------------------



** In the early 70s, the only PA product Bose sold was the model 800
speaker.


Very wrong. Again. The units mentioned are 802.



** The Bose 802 speaker came much later, a totally plastic box with plastic frame woofers with twin,front ports - absolutely no wood or vinyl as YOU described - which *were* features of the 800 model

So Plowman is a LYING **** and continues to make **** up cos he has no facts.


Wood. You can buy some if you want

https://www.gumtree.com/p/home-cinem...ers/1247132054

d

---
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Don Pearce wrote:

-------------------------


Wood. You can buy some if you want



** The 802W ( wood & plastic ) is a rare, later version of the plastic 802.

As you damn well know.

You stinking pommy ****.




...... Phil

In article ,
Phil Allison wrote:
Dave Plowman Criminal Psychopath & Pommy **** wrote:

-----------------------------------------------------



** In the early 70s, the only PA product Bose sold was the model 800
speaker.


Very wrong. Again. The units mentioned are 802.



** The Bose 802 speaker came much later, a totally plastic box with
plastic frame woofers with twin,front ports - absolutely no wood or
vinyl as YOU described - which *were* features of the 800 model

Who mentioned wood - apart from you?

They were around in the mid 70s in the UK.

I don't give a stuff when you first saw them.

--
*If only you'd use your powers for good instead of evil.

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
Phil Allison wrote:
Don Pearce wrote:

-------------------------


Wood. You can buy some if you want



** The 802W ( wood & plastic ) is a rare, later version of the plastic 802.

As you damn well know.

You stinking pommy ****.


And Brexiteers say the way forward is a trade agreement with Oz. Only if
we can supply them with some decent meds.

--
*The problem with the world is that everyone is a few drinks behind *

Dave Plowman London SW
To e-mail, change noise into sound.

In article , Phil
Allison scribeth thus
Trevor Wilson wrote:

--------------------

Phil Allison wrote:

Bose are for Bozos.

**Emphatically agreed.

I, too, have worked on some 1801 amps. Burned PCBs, smoked outputs, etc.
Horrible design.



** Did you see failures of the soft start resistor ??

If the amp is ever switched on with strong audio signal present at the input,
the combination of a huge transformer & filter capacitor inrush plus audio power
to the speakers at that moment smoked the 8 ohm, 10W resistor.

Happened to *every* Bose 1800 owned by the hire business I did repairs for.

Main cause was the LACK of input mating at switch on.

As the amps built up more hours, the hot running 3k/2W carbon comp resistors on
the power boards fell in value to under 1kohms casing their associated 15V zener
to fail short. This meant the op-amp at the input lost one rail and sent the
output stage to full DC !!!!

The VI limiting circuit for the output transistors was super fast and
overcooked. With even a mildly reactive 8 ohm load, +/- full rail spikes
appeared on the output at less than rated power.

Oh, and if the AC supply went even a little high, the amp hummed.



My schem is marked with simple fixes for all the above.



Who designed it originally, anyone we might have heard of?...



..... Phil

--
Tony Sayer

Dave Plowman Lying Pile of Pommy **** wrote:

---------------------------------------------




** In the early 70s, the only PA product Bose sold was the model 800
speaker.


Very wrong. Again. The units mentioned are 802.



** The Bose 802 speaker came much later, a totally plastic box with
plastic frame woofers with twin,front ports - absolutely no wood or
vinyl as YOU described - which *were* features of the 800 model

Who mentioned wood - apart from you?


** You ****ing did.

Your " vinyl covered with lids " remark describes the 800 exactly.

No 802s in the early 70s.


...... Phil

tony sayer wrote:

-------------------


Phil Allison wrote:

Bose are for Bozos.

**Emphatically agreed.

I, too, have worked on some 1801 amps. Burned PCBs, smoked outputs, etc.
Horrible design.



** Did you see failures of the soft start resistor ??

If the amp is ever switched on with strong audio signal present at the input,
the combination of a huge transformer & filter capacitor inrush plus audio power
to the speakers at that moment smoked the 8 ohm, 10W resistor.

Happened to *every* Bose 1800 owned by the hire business I did repairs for.

Main cause was the LACK of input mating at switch on.

As the amps built up more hours, the hot running 3k/2W carbon comp resistors on
the power boards fell in value to under 1kohms casing their associated 15V zener
to fail short. This meant the op-amp at the input lost one rail and sent the
output stage to full DC !!!!

The VI limiting circuit for the output transistors was super fast and
overcooked. With even a mildly reactive 8 ohm load, +/- full rail spikes
appeared on the output at less than rated power.

Oh, and if the AC supply went even a little high, the amp hummed.



My schem is marked with simple fixes for all the above.



Who designed it originally, anyone we might have heard of?...



** Seems to be a well kept secret.

Other Bose 1800 marks ( up to VI) were rebadged amps made by BGW and later Carver.


..... Phil



Tony Sayer