VTL Deluxe 140 monoblocks info required

[lowpoke]

I’ve recently acquired some very nice VTL Deluxe 140 monoblocks. I can’t find a manual anywhere, so if anybody has a soft copy they could send me I’d be most appreciative.

My question pertains to the 5 switches across the chassis. Can anybody shed some light on which ones switch beween triode/pentode mode ... and which way is which?
And which one is the feedback switch ... and which way adds/subtracts the feedback?
Any assistance much appreciated.

 

[llwhtt]

Have you tried asking VTL? Send an email to Luke or Bea and see if they have an owner's manual.

The center switch will be the FB the louder position will be the less feedback position. As for the triode/tetrode, in triode mode there will a lot less power. Try putting all of the switches in one position, either forward or backward, and check the power out. Then turn the amp off and switch the to the opposite position, more or less power? NEVER EVER use the those switches with the power on!!!!!!

Craig

 

[lowpoke]

Thanks Craig,

I recall reading another thread where someone had called VTL for info about older products, and they reported they were only interested in trying to sell them new components.

Thanks for your suggestions. I’ll just need to take some measurements. I knew this of course, but I was being lazy. 😁

 

[jazbo8]

A couple of under-the-chassis shots may help, just have to trace how the switches are connected.

 

[multi]

Some time ago I repaired a VTL 807 amp push pull previous repair man had set the bias to 70 ma The 807's had 600 volts triode connected for 50 watts, was supposed to be 35ma.
I wondered if the VTL Deluxe 140 mono blocks are single ended?
I have never been able to find a circuit for the 50 watt 807 triode amp; I was under the impression VTL does not supply Circuits? Interest how they get 50 watts.

 

[multi]

I checked on internet and the VTL 140 is push pull.

 

[analog_sa]

The center switch will be the FB the louder position will be the less feedback position.

Not necessarily. Half of the switch is often used to switch a resistor divider and compensate the gain.

It is trivial to peek under the bonnet, but i wonder: if someone cannot distinguish by listening the feedback/no feedback and triode/pentode positions, why are they in this hobby?

 

[analog_sa]

I checked on internet and the VTL 140 is push pull.

VTL have also single ended amps? 🙂

 

[lowpoke]

It is trivial to peek under the bonnet, but i wonder: if someone cannot distinguish by listening the feedback/no feedback and triode/pentode positions, why are they in this hobby?

I am not running these amps into a single pair of speakers. They’re being used in an active four way setup and at present, only amplifying very high frequencies. It’s not obvious by listening at all in this scenario. But as Craig has suggested I’ll just make some measurements.

I was just hoping someone with experience with these amps might have the answer off the top of their head and save me some time.