Quad Spot
This Blog is about revising/upgrading the vintage Quad 33 to 909 amplifiers and the Revox taperecorders. Audio electronics and High End Hifi are also absolutely "on-topic" here. All pictures on this site (except the schematics) are Copyright Dada Electronics. You can use them after a written agreement (via e-mail) with the author. For Contact-information see www.dadaelectronics.eu
Previous Posts
- Quad 303 & Dada's High-en boards & Tannoy 215DMT
- DACT CT-2 Attenuators available again
- Dada Electronics Ecological mission statement
- Quad 44 Erratic Input Switching
- Quad 405 switch-on behaviour
- Quad USA Seventies price list
- Quad 34 capacitor problems
- Power supply voltage in a Quad 33; 12, 15 or 16V? ...
- PNP or NPN TR1 in the Quad FM2?
- "Quad 405" ?
5 Comments:
Does the toroid have a positive effect on sound? or does it just get rid of a buzzing tx please? Lee.
hello, in my case, i changed the transformer to toroid. the sound became more clean & quiet. maybe someone don't like that. :D
I think if the transformer is in a good shape, it shouldn't make any difference to our ears whether it is toroidal or the other.
After all, the sound doesn't use the ac voltage at all, it uses the dc voltage. Every thing is well filtered by the 10000uF and if necessary we can add small caps on each rail on each board (like from 0.1uF to 100mF) the +50v and the -50v.
I have no problem with mine, but with time xfo can become tired, the varnish of the wires inside might deteriorate (I don't have experience nor knowledge of xfo's lifetime so it is a thought only).
Maybe I can be put right by more knoledgeable people than me.
Daniel
Sorry, I wrote "from 0.1uF to 100mF.
We should read 100uF not 100mF.
Daniel
Just to put me right myself, I found from a good source that yes the original kind of transformer is difenitly better than the toroidal when both in perfect condition. Aparantly the toroidal can introduce some kind of noise.
Daniel
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