700/B/Ser II Transformers

[WOPL Sniffer]

I found one..... $550 for 1....

Ouch

 

[oldphaser]

I found one..... $550 for 1....

Ouch

Perry,

Yeah that one has been on the internet for years. Way out of line as far as I'm concerned.

They come up on ebay every 2-3 years. Price is usually around $20-$50.

Ed

 

[Gepetto]

Perry,

Yeah that one has been on the internet for years. Way out of line as far as I'm concerned.

They come up on ebay every 2-3 years. Price is usually around $20-$50.

Ed

Of course there here is a better way

 

[laatsch55]

Well, of course....

 

[grapplesaw]

Glen , those toroids are only 624va under load. You won't get much more than a standard 700 current wise, that's why I was going with 2 per side....
[/QUOTE]

Ok Lee I think I am on board here.
so this should handle One channel of 550 watts into 8 ohms then right?

Here is what I was thinking.
Two mono units for 550 watts each
each one contains:
one transformer 624va
rail voltage 118 -0 -118
power caps 2 x 150v 22,000 uf
The amp will not be bridged
total 16 drivers in full complemtary setup
one channel driving both back planes from control board.

 

[laatsch55]

Glen , those toroids are only 624va under load. You won't get much more than a standard 700 current wise, that's why I was going with 2 per side....

Ok Lee I think I am on board here.
so this should handle One channel of 550 watts into 8 ohms then right?

Here is what I was thinking.
Two mono units for 550 watts each
each one contains:
one transformer 624va
rail voltage 118 -0 -118
power caps 2 x 150v 22,000 uf
The amp will not be bridged
total 16 drivers in full complemtary setup
one channel driving both back planes from control board.[/QUOTE]

Glen I don't think you'll get 500 watts out of 624 va tranny......I used a 700va toroid on D2's 700B with rails of 102 and only got 400.....

 

[laatsch55]

Of course there here is a better way

We expect no less from you Joe!

 

[grapplesaw]

Ok Lee I think I am on board here.
so this should handle One channel of 550 watts into 8 ohms then right?

Here is what I was thinking.
Two mono units for 550 watts each
each one contains:
one transformer 624va
rail voltage 118 -0 -118
power caps 2 x 150v 22,000 uf
The amp will not be bridged
total 16 drivers in full complemtary setup
one channel driving both back planes from control board.

Glen I don't think you'll get 500 watts out of 624 va tranny......I used a 700va toroid on D2's 700B with rails of 102 and only got 400.....[/QUOTE]

ok time to abandon this ship. The spec sheet indicated 153 volts at 5 amps. I thought they would give 750va.

 

[grapplesaw]

Time to look at cascade setup

See if you can understand this explanation. I read a few times and have got the just of it but no way I can draw a high power amp from this.

https://www.ieee.li/pdf/essay/cascode_amplifiers.pdf

Here is a sechmatic for cascade amp. We can use any front end but the backplate looks simple enough.

 

[laatsch55]

Glen I don't think you'll get 500 watts out of 624 va tranny......I used a 700va toroid on D2's 700B with rails of 102 and only got 400.....

ok time to abandon this ship. The spec sheet indicated 153 volts at 5 amps. I thought they would give 750va.[/QUOTE]


Not loaded it won't....

 

[grapplesaw]

ok time to abandon this ship. The spec sheet indicated 153 volts at 5 amps. I thought they would give 750va.

Not loaded it won't....[/QUOTE]
Bummer. I guess I will still build then as planned

 

[Gepetto]

Here is a sechmatic for cascade amp. We can use any front end but the backplate looks simple enough.

That is not a cascade amp.

That is an amp with Darlington output devices.

 

[WOPL Sniffer]

why thank you Darling(ton).

 

[grapplesaw]

I am am lost now Cascode or Cascade

That is not a cascade amp.

That is an amp with Darlington output devices.

Ok I had a typo I ment Cascode of which has a Darlington setup I believe.



Now which is it we want for this project and is there a schematic somewhere to look at

 

[WOPL Sniffer]

I just finished ordering the parts for the mono boards. Next week I'll order backplanes from Joe. Looks like a pair of inverted channel Mono Blocks is in the works for me. I just need to make heads or tails of the directions from your source. I need to find some heat sinks from a 700.

 

[grapplesaw]

Sounds good Perry

i will put an amp meter in mains of a dual 500 and check how much current one channel draws if less than let you know what that is

 

[WOPL Sniffer]

Sounds good Perry

i will put an amp meter in mains of a dual 500 and check how much current one channel draws if less than let you know what that is

Less Than what????

 

[WOPL Sniffer]

Not really worried about it, since the basic amp will still be a WOPL but with an inverted channel. Testing will be the key. slowly and gently...

 

[WOPL Sniffer]

does anybody smell smoke????

Keep it on the DUMB BULB TESTER....

 

[grapplesaw]

I got the lab ready