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davidgem1406 · 1st Jun 2019, 5:16 pm

Thanks to everybody for the input and such useful information.

I have to correct the valve used for the oscillator. I said it was an ECC82, having looked at the circuit. In fact the valve in my unit is an ECC91 this being intended for VHF .

I have 5 copies of the service information 2 stating ECC82, whilst the other 3 are not readable well enough to be sure what they say.

The ECC91 I have just tested again the result being Ma/v 5.4 and 5.7. Data sheet gives 5.3.

I do have a spare ECC91 but it is much the same at Ma/v of 5.1 and 5.2, little point in changing it.

I will run another set of tests, this time using the attenuator in circuit and see what happens.

Also I am thinking of making an adaptor to be able to plug into the 7 pin base an ECC81, maybe.

Best regards,
Dave.

1st Jun 2019, 5:16 pm	#12
davidgem1406 Heptode Join Date: Feb 2011 Location: Sheerness, Kent, UK. Posts: 936	Re: Advance E2 with problems. Thanks to everybody for the input and such useful information. I have to correct the valve used for the oscillator. I said it was an ECC82, having looked at the circuit. In fact the valve in my unit is an ECC91 this being intended for VHF . I have 5 copies of the service information 2 stating ECC82, whilst the other 3 are not readable well enough to be sure what they say. The ECC91 I have just tested again the result being Ma/v 5.4 and 5.7. Data sheet gives 5.3. I do have a spare ECC91 but it is much the same at Ma/v of 5.1 and 5.2, little point in changing it. I will run another set of tests, this time using the attenuator in circuit and see what happens. Also I am thinking of making an adaptor to be able to plug into the 7 pin base an ECC81, maybe. Best regards, Dave.