Help needed to identify this british made Amp

[london]

Help needed to identify this British made Amp.

I got this amp and radio tuner two month ago. There is no name no model id what so ever. It has 2 5Y3 and 4 6v6. Uses cable to connect to a multiband tuner.

I am looking for schematics. thanks

 

[devilsindetails]

What about the other little 9-pin sitting there?

The hammertone finish seems Rogers/Cadet-ish to me but i've seen similar ivory bell covers on the PT's of some ole Electrohome chassis.... how bout a pic of the Tuner?

 

[Eli Duttman]

Leo,

2X 5Y3s are good for 250 mA. and that is more than enough to support 4X 6V6s. Does the power amp PSU energize the tuner too?

I can see converting that mono setup into a stereoblock. New O/P "iron", say Edcor, would be needed. To avoid punching a hole for an additional 9 pin socket, use a single twin triode (12AX7?) as the voltage amplifier for both channels and MOSFETs (ZVN0545A?) for the "concertina" phase splitters. More or less ripping the Dyna ST35 off is what I'm aiming at.

 

[london]

I think one 5Y3 on the top side feeds the tuner.
it uses 6LD3 which is on the top.
the pictures below are tuner

 

[london]

all the tubes were made in England except 6v6 and 5y3.

 

[Eli Duttman]

The rectifier pair would be shared amongst all the electronics. A single 5Y3 can't support 4X 6V6s.

I'm guessing the tuner is AM only, from the appearance of the variable capacitor and the 3 IF "cans".

Combine an AM tuner with a mono power amp that seems to contain a small O/P transformer in relation to its power O/P and I'm starting to think we're looking at the "guts" of a "top shelf" console radio.

The 6LD3 is a Loctal based tube that would be found in an AM radio. What is the miniature tube on the amp chassis?

 

[TheGimp]

Would it be possible to trace the license plate serial number? Does the certifying agency still exist?

 

[devilsindetails]

Well this one is intriguing...the chassis has definite British markings and hook-ups but the 6V6, 5Y3 topology isn't typically Anglo implementation for this period IMO....but I am definitely thinking Rogers/Cadet as they made some equipment here in Canada and I've had a couple of strange Rogers/Cadet types on the shelf myself.

The British license tag throws me off, however. How bout a pic of the harness? Might help narrow it down a little further or at least eliminate some possibilities.

Might be time for some of the Brits here to 'ave a look-see...DF96 and others?

 

[Eli Duttman]

Another look at the photos shows the tube on the amp's top IS a 6DL3. That's a rim lock, not Loctal, socket.

I'm reasonably certain, at this time, that we are dealing with a fancy radio's innards.

Beyond doubt, the power trafo is substantial. If a conversion to a HIFI stereoblock is to be made within the confines of the existing chassis, space for 2X new O/P trafos is limited. I believe 2X Edcor GX series parts could fit into the limited available space. In order to get full HIFI bandwidth, triode wired finals are necessary. That's far from bad, but approx. 6 WPC is what will be obtained and mid 90s efficient speakers are needed.

 

[Eli Duttman]

I'd like to get a better view, from above, of the corner partially obscured by the power trafo in the clip I've uploaded.

 

[london]

The rectifier pair would be shared amongst all the electronics. A single 5Y3 can't support 4X 6V6s.

I'm guessing the tuner is AM only, from the appearance of the variable capacitor and the 3 IF "cans".

Combine an AM tuner with a mono power amp that seems to contain a small O/P transformer in relation to its power O/P and I'm starting to think we're looking at the "guts" of a "top shelf" console radio.

The 6LD3 is a Loctal based tube that would be found in an AM radio. What is the miniature tube on the amp chassis?

That is 6LD3 indeed.
The tuner is multiband. It has 9 bands ot 8 band I forgot(from the picture I can see 11m, 13m, 16m,19m,25m,31m,43m,140m,370m and Am bands) but only work on two bands. I am not sure it has a FM.

 

[devilsindetails]

I'd like to get a better view, from above, of the corner partially obscured by the power trafo in the clip I've uploaded.

Yes...let's get the satellite view of the entire top of the chassis London!

Pic of the harness too....Leak and Quad harnesses are quite unique as were the Rogers/Cadets...will help eliminate a few manufacturing origins at the very least....still waiting for the Brits to give this a look...where are the Red-Coats?

 

[Eli Duttman]

Now, I have little doubt. That's a very fancy multi-band AM radio. The 3 section tuning cap. indicates a TRF front end before the IF conversion circuitry. That is a mark of quality.

Considering it was removed from its cabinet, which contained the loudspeaker, I suspect it has nearly zero collector appeal.

JMO, make the conversion to a stereo HIFI setup. That's a very substantial power trafo and at least 1 filter choke is mounted on the underside. Transplanting the power "iron" to a new, larger, chassis would allow you to use the excellent Z565 Dynaclone O/P trafos for a darned nice result, with power in the 12 to 15 WPC range. Please notice that all switching functions are on the tuner. There's that big, red, umbilical that connects to 2 "boxes". As I previously stated, you are seriously space constrained trying to reuse the existing amp chassis. BTW, there's more than enough heater current available to avoid FET phase splitters and support tubes in that job, if room for more sockets was available. Chalk another point up for a new, roomy chassis.

You make the call as how to proceed from this point forward.

 

[devilsindetails]

Well...it's not a Rogers/Cadet, Pye or Electrohome...and definitely not a Leak or Quad variant...could be a difficult one....try heading over to Antique Radios Forum...the dial face is quite distinct and those old super-het radio old-timers never forget a pretty radio face...worth a shot...especially since the Brits here aren't helping us narrow this down

 

[london]

Now, I have little doubt. That's a very fancy multi-band AM radio. The 3 section tuning cap. indicates a TRF front end before the IF conversion circuitry. That is a mark of quality.

Considering it was removed from its cabinet, which contained the loudspeaker, I suspect it has nearly zero collector appeal.

JMO, make the conversion to a stereo HIFI setup. That's a very substantial power trafo and at least 1 filter choke is mounted on the underside. Transplanting the power "iron" to a new, larger, chassis would allow you to use the excellent Z565 Dynaclone O/P trafos for a darned nice result, with power in the 12 to 15 WPC range. Please notice that all switching functions are on the tuner. There's that big, red, umbilical that connects to 2 "boxes". As I previously stated, you are seriously space constrained trying to reuse the existing amp chassis. BTW, there's more than enough heater current available to avoid FET phase splitters and support tubes in that job, if room for more sockets was available. Chalk another point up for a new, roomy chassis.

You make the call as how to proceed from this point forward.

The whole thing works fine, until I unplugged the red cord by accident. It got loud humming noise after but still works. It might be bad caps due to the voltage spikes.
the cabinet made of thick plywood. The front face was sandwiched with at least 10 pounds of sand(must be for the speakers). I destroyed the cabinet anyway cause it takes up so many room in my garage.
I kept all the parts even the stainless screws for making the cabinets.
It came with a Garrard RC80M which I already restored.

 

[devilsindetails]

That sir, is a Gilbert Briggs Wharfedale set!!!!

The sand filled baffle is a dead give-away...as are the drivers!!!!

I will look through my old Wharfedale lit...and see if I can narrow down the model etc...the loudspeakers by the by are wonderful finds!

 

[london]

Well...it's not a Rogers/Cadet, Pye or Electrohome...and definitely not a Leak or Quad variant...could be a difficult one....try heading over to Antique Radios Forum...the dial face is quite distinct and those old super-het radio old-timers never forget a pretty radio face...worth a shot...especially since the Brits here aren't helping us narrow this down

I already tried in antiqueradios.com . did not work well.

 

[london]

That sir, is a Gilbert Briggs Wharfedale set!!!!

The sand filled baffle is a dead give-away...as are the drivers!!!!

I can not keep the cabinet. its too bulky. fortunately I kept all the parts.

BTW, how much does that speaker set worth. I want to buy another set and make a stereo.

 

[devilsindetails]

Because they are both AlNiCo versions they will be a lot pricier then the ceramic versions of these drivers...you might be better selling these off to finance a complete L and R set of other Wharfedale drivers....r u sure there wasn't a tweeter hiding in that cabinet somewhere?

Based on the ridiculous prices I've seen these two pictured drivers go for it won't be cheap to get another pair...IMO...

 

[Eli Duttman]

Now the picture becomes clearer. That was an absolute top of the line item, in its heyday.

Creme de la creme Wharfedale drivers. SHEESH!

I would not use the Garrard with LPs, given its tone arm and rumble. The RC80M will "kill" playing 78s, should you have them. The external pusher mechanism of the changer does not damage the center holes of records. 🙂

I'm with Leo. Sell the Wharfedale drivers for all that the traffic will bear, to fund your other efforts.

This DECWARE speaker will work well with triode wired PP 6V6s. Of course, you can DIY your own set of medium efficiency speakers.