Sir jim l . . . . .

In looking at the specs of the 3Q5 we see a 7AP octal terminal diagram being used, while the 1Q5 is using a 6AF octal terminal diagram.

*** (at page bottom) (Having very slightly different configurations of their inner tube elements breakouts.)

Another possibility, is that of knowing your tube tester THOROUGHLY enough . . . to see what could then be done with its settings to possibly cover that second tube type.

With consultation of its wiring schematic, one is looking to see if there are primary terminating points of the 1st grid, screen grid, supressor grid, cathode , plate and filament connections over in the test section, that are fed to either rotary switches or sliding lever switches which are then selecting the particular pin of a tube socket , needed to be routed over to that particular assigned test node.

Looking at your testers design . . . that is not to be . . . it seems that instead of your unit being a full fledged mutual transconductance tester.

( Which is actually hooking up supply voltages to the aforementioned separate tube elements and then actually evaluating the dynamic amplification capabilities of a tube.)

Alas, your unit is merely heating up its filament and then checking emission activity between two other tube elememts.

Now in the consulting of its manual I am seeing that it is taunting the mere use of 5? or so tube sockets on the top deck, to equate with the testing capabilities of testers with decades of different sockets mounted atop their testers.

BUT if you will consult the bottom of your manuals page 31, you will that see their basis for that capability is merely dependent upon the fact that ultimately, most 7 pin mini tubes use 3-4 for their filament connections, most 9 pin mini tubes use 4-5 for their filament connections while most octals use 2-7 or 7-8 for their filament connections.

The problem of ferreting out which other tested two tube elements . . . cathode and plate . . . are then found out by the settings of L and R switches into their different positions.

One thing that IS being done thoroughly in this tester, is the testing of a tube for:

1 . . . Grid emission

2 . . .Inner leakage between tube elements . . . (or across a mica insulator separator disc )

3 . . .* Connectivity to a tube element (e.g. an opened spot weld)

That testing is relegated to the use of the incorporated design of the 12AU7 tube and DC coupled amplification for the meter drive circuitry . . . much akin to a VTVM . . . in its isolating of the test meter along with its high Z impedance being presented when used in its ohmmic testing mode between tube elements.

As per your manual schema page 29.

* In this test, they are relying upon individual tube elements to act like ersatz "plates" to confirm a small degree of emissivity being shown on the test meter when checking for connectivity from a tube pin to its successfully making its final inner connection to a 1st Grid-- Screen Grid-- Suppressor Grid-- diode det plate, etc, within the tube.

Consult your manuals chart on page 31 for a further defining of those capabilities.

Now, in using that info, for the "Cow pee 'de grass" as you Americains say . . . . o 'cest coup de grace.

NOTICE . . . that your chart DOES give the capability of the testing of "little brother" 1Q5 with its 1.4 volt filament voltage requirement, wherein it is being applied across pins 2 and 7.

And the settings are :

Fil 1 ---D---90---X(p)
Soooooooooo . . . just place the filament voltage one step up to the 3 setting and then test the 3Q5 tube as a 1Q5, but with use of that required higher filament voltage.

In this case, there is a disparities in the two basings pin 8 handlings, but this does not get involved, with the filament voltage only being received between 2--7.

Now in switching into full Crystal Ball mode . . . . . . methinks . . . that tubes gonna' test out as being OK.

ZENITH 6G001:

Which is / are your problem 117Z6 related problem resistor(s) ? . . . . assuming that your real hot / burnt resistor likely would have been that R8 input resistor, and probably, its initial demise just might have been related to the filter cap(s) shorting or having exhibited HIGH leakage?

Or . . . if R11 is also a problem, since it is mainly providing its most current intensive feed to the outut tube.
However, that high 1500 ohms does provide quite a voltage drop and associated current limiting, unless there is additionally being some serious low resistance load being on past it . . . . or even a short.

Having the ray-dee-oh powered down and switched to the battery position might be helpfull in the isolating of the power supply section while ohmming out those resistors against ground, as that position would have the power supply isolated from being connected into the radios loads .

If all seems to be cool in the resistors current conditions, you just might have ALREADY found the problem, in the form of those replaced filters.

If not having found any low resistance across the B+ output of the 117Z6 circuitry, I would then be switching back to AC operation and testing for proper plates and screen voltages presence upon the 3Q5 and its audio companion the 1LH4.

If those check out to be properly voltage fed, then pull out 2 clip lead ended test leads and a .001 ufd capacitor.

One leads clip lead end goes to one lead of the cap the other end goes to the plate of the 3Q5.
The other leads clip lead end goes to the free end of the capacitor and its other end goes to the high side of the volume control.

Now, with a powering up of the set, and then the upward advancement of the volume controls setting, you should have now found yourself, with one each, variable frequency, power oscillator, which can really give that speaker a work out.

And of course, its ouput level will certainly be confirming . . . no problem . . . . . with your audio output tube, audio driver tube, output transformer, speaker , volume control and their associative supply voltages presences.

*** Tube referencing:

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73's de Edd