Nady TD 1, guitar tube distortion effect pedal

eat

ard

Norm:

What is a "gland" called on the western side of the big pond?

Bob Hofmann

On 3/28/2009 6:29 PM hr(bob) snipped-for-privacy@att.net spake thus:

I would guess a grommet, but I think they (UK) have grommets over there too.

--
Made From Pears: Pretty good chance that the product is at least
mostly pears.
Made With Pears: Pretty good chance that pears will be detectable in
the product.
Contains Pears:  One pear seed per multiple tons of product.

(with apologies to Dorothy L. Sayers)

great

standard

on

Norm:

What is a "gland" called on the western side of the big pond?

Bob Hofmann

__________

More than a grommet, a way of anchoring the sleeving , by compression ring or joggled clamp. So the cable cannot twist and twist and ventually fracture inside the box. So what are those called in the US ? and I will add to my translator

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

great

standard

Is this another valve con job? (dated 2004) Had to get inside to check the wiring as cold testing not consistent with a transformer and no confirmation anywhere other than anecdotal/verbally that the supply is 9-0-9 ac, centre ground.

That feeds a bridge R and then 7806 and 7906, 4 4580D smd opamps and a

12AX7. Where is the HT supply ? caps are 10V,16V or 50V, input socket contains 2 crudely epoxied small unlabeleed black lumps with 6 pins one has pin-pin resistance readings of 13K,360R and 0.1R or less the other 18K,360,720, 0.1R or less So perhaps transformers there, but smps combined with input amp in a can? ?. A smd 8pin device marked AD 741 and OP 275G and a few TO92 transistors but nothing SMPS looking inside.

Then the final test, the wiring to the valve. Whether plugs are in or out of the 1/4 inch sockets the anodes of the genuine looking , but no label valve, are connected to one end of the heater chain. No viewing hole to let the owner see the presence of a glowing valve for the psychological effect of the valve sound. This unit is new working order as the owner checked it with another owner's ps.

Incidently note the various casing screw lengths, on disassembly as the long ones would touch the pcb if replaced wrongly

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

On 3/29/2009 12:34 AM N_Cook spake thus:

I could tell you what they're called here if you could explain what a "joggled clamp" is. Never hoid of such a thing.

Sure it's not what we call a "strain relief" fitting? Those are usually only used for power (flat) cords.

--
Made From Pears: Pretty good chance that the product is at least
mostly pears.
Made With Pears: Pretty good chance that pears will be detectable in
the product.
Contains Pears:  One pear seed per multiple tons of product.

(with apologies to Dorothy L. Sayers)

A gland is the name for a close fitting surrounding a shaft, pipe or cable, designed to prevent the ingress of foreign matter - liquids, dust' ect, or leakage of lubricants etc.

Ron

On 3/30/2009 2:40 AM Ron spake thus:

That answers that question, but what is a "joggled clamp"?

--
Made From Pears: Pretty good chance that the product is at least
mostly pears.
Made With Pears: Pretty good chance that pears will be detectable in
the product.
Contains Pears:  One pear seed per multiple tons of product.

(with apologies to Dorothy L. Sayers)

The cable entry glands that come in two parts, linked together, that require a D shaped cutout through the chassis and joggle the cable where it passes through, so locking against rotation and being pulled out.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

yes, it`s like a saddle clamp, which forces the cable into a U shaped indentation, generally ensuring that one or both of the conductors fail in a very short time - horrible design.

:>>> David Nebenzahl wrote: :>>>> On 3/29/2009 12:34 AM N_Cook spake thus: :>>>>

:>>>> Sure it's not what we call a "strain relief" fitting? Those are usually :>>>> only used for power (flat) cords. :>>> A gland is the name for a close fitting surrounding a shaft, pipe or :>>> cable, designed to prevent the ingress of foreign matter - liquids, :>>> dust' ect, or leakage of lubricants etc. :>> That answers that question, but what is a "joggled clamp"? :>>

:>>

:>> -- :>> Made From Pears: Pretty good chance that the product is at least :>> mostly pears. :>> Made With Pears: Pretty good chance that pears will be detectable in :>> the product. :>> Contains Pears: One pear seed per multiple tons of product. :>>

:>> (with apologies to Dorothy L. Sayers) :> :> :> The cable entry glands that come in two parts, linked together, that require :> a D shaped cutout through the chassis and joggle the cable where it passes :> through, so locking against rotation and being pulled out. :> : :yes, it`s like a saddle clamp, which forces the cable into a U shaped :indentation, generally ensuring that one or both of the conductors fail :in a very short time - horrible design.

If you mean one of these

then your comment about conductor failure surprises me. In the 30 years (approx) these have been around they have been used in countless appliance applications and I have never seen cord conductors fail at the strain relief point. Of course it would depend to some extent on how much flexing takes place at that point. But they were never intended to be used where constant flexing at the cable entry point occurs. Where flexing at the entry point is unavoidable, bend reduction techniques must be employed in addition to cable securing.

eat

ard

Wow....thats a little tiny piece of crap IMO. Found a gut shot of it and there's nothing in the box hardly. Its a starved plate design. It may have a simple voltage multiplier to get a plate supply of

30-40vdc....kinda like the "tube driver" branded boxes from the early 90s.

Where are these being sold at and for how much? The box may be good for something if its a closeout deal....

no larger voltages on the valve than the -6 volt and +6 volt to the heaters and unit worked perfectly normally when tested .

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

rs

So what voltage was on the plates then? I doubt a 12a*7 will do much of anything at a 12v plate supply.

The penny has dropped

On 4/3/2009 1:12 PM snipped-for-privacy@techie.com spake thus:

Sounds like the tube is a phoney-baloney device, as Norm suspects: just there for show.

"Tube sound" my ass. (In this case, anyhow.)

--
Made From Pears: Pretty good chance that the product is at least
mostly pears.
Made With Pears: Pretty good chance that pears will be detectable in
the product.
Contains Pears:  One pear seed per multiple tons of product.

(with apologies to Dorothy L. Sayers)

The ARN-6 Direction finding receiver used 24 volts on the plates of all the tubes, which were mostly 12SN7. It was one of the hottest AM DX radios I ever owned. It drew 28 A @ 24 volts before I converted it to solid state. The 400 Hz Copper supply for the antenna servos drew most of the power. After the conversion, it ran on a single 9 volt battery, when used with an external audio amp.

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And another motherboard bites the dust!

On 4/3/2009 1:48 PM N_Cook spake thus:

????????

-- Made From Pears: Pretty good chance that the product is at least mostly pears. Made With Pears: Pretty good chance that pears will be detectable in the product. Contains Pears: One pear seed per multiple tons of product.

(with apologies to Dorothy L. Sayers)

ters

The point of the device seems to be clipping, which will=20 happen at a low signal level with LV plate supply. Thus,=20 "tube distortion"!