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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 12:27 pm
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upnorth2 wrote:
Have the screen and grid resistors been checked?

UN


+1

On each 6V6, 470 ohms 2 watts and 1,500 ohms 1/2 watt


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 12:48 pm
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stratele52 wrote:
upnorth2 wrote:
Have the screen and grid resistors been checked?

UN


+1

On each 6V6, 470 ohms 2 watts and 1,500 ohms 1/2 watt


I did test them (not with a leg lifted) and they tasted fine. however there is also a disc cap on top of each 6V6 in this particular amp??


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 12:50 pm
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BMW2002Ti wrote:
http://ampwares.com/schematics/deluxe_reverb_boost.pdf

Ryan41018 wrote:
Are these the Disc caps or the Blue bulgy ones?



The caps that have red arrows next to them. Measure VDC at green arrows.

You will need to pull one leg of each 330k-ohm resistor (orange-orange-yellow) tail of the PI (my photo has 1 meg-ohm resistors ---- (brown-black-green), as I reverted the circuit back to AB763). They are below the pink asterisks.

Image



I will inspect after work today.


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 1:23 pm
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Ryan41018 wrote:
however there is also a disc cap on top of each 6V6 in this particular amp??


Yes 1200 pf , to remove parasitics oscillations.


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 1:53 pm
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stratele52 wrote:
Ryan41018 wrote:
however there is also a disc cap on top of each 6V6 in this particular amp??


Yes 1200 pf , to remove parasitics oscillations.


Oh, I understand.


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 2:20 pm
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Clean all tubes socket connector and re-tighten them.

I supect Output Transformer :(


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 2:30 pm
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stratele52 wrote:
Clean all tubes socket connector and re-tighten them. I did this already (D05) on sockets, retention power tube sockets but not the pre-amp........

I supect Output Transformer :(
(UGH!!!)


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 3:00 pm
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Ryan41018 wrote:
stratele52 wrote:
upnorth2 wrote:
Have the screen and grid resistors been checked?

UN


+1

On each 6V6, 470 ohms 2 watts and 1,500 ohms 1/2 watt


I did test them (not with a leg lifted) and they tasted fine. however there is also a disc cap on top of each 6V6 in this particular amp??


I know that's a typo but I gotta ask anyway. What did they taste like? :lol:


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 3:46 pm
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upnorth2 wrote:

I know that's a typo but I gotta ask anyway. What did they taste like? :lol:


Or he is another no english speaking like me :lol:


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 6:00 pm
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stratele52 wrote:
upnorth2 wrote:

I know that's a typo but I gotta ask anyway. What did they taste like? :lol:


Or he is another no english speaking like me :lol:



LOL!!!! Typo Brutha~


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 6:39 pm
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Ryan41018 wrote:
BMW2002Ti wrote:
http://ampwares.com/schematics/deluxe_reverb_boost.pdf

Ryan41018 wrote:
Are these the Disc caps or the Blue bulgy ones?



The caps that have red arrows next to them. Measure VDC at green arrows.

You will need to pull one leg of each 330k-ohm resistor (orange-orange-yellow) tail of the PI (my photo has 1 meg-ohm resistors ---- (brown-black-green), as I reverted the circuit back to AB763). They are below the pink asterisks.

Image



I will inspect after work today.



So as you instructed I did the following 3 VDC tests after lifting the two legs of the 330K Resistors.

Measured Caps on the one leg "out of the solder hole"
Left Bulgey Blue Reads: 0.055
Right Side Disc Cap Reads: 0.004

Left (where the blue bulgy one is) VDC at "Hole Only" -1.004
Right (where the disc cap is) VDC at "Hole Only" -1.121

Left Blue Bulgy in hole with white wire -0.835
Right Disc in hole with white wire -0.962

Did I do this right??


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 6:47 pm
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upnorth2 wrote:
Have the screen and grid resistors been checked?

UN


Yep they have tested within spec.


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 6:48 pm
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That seems better. The values were read with the amp "hot," correct? Black lead of DVM clipped onto chassis, right? Amp on, speaker connected. No guitars plugged in. Volumes at "1."

But, what are your VDC readings at pin 2 and 7, of the 12AT7 phase inverter? Those should be close to the readings off the coupling caps.


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 9:18 pm
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BMW2002Ti wrote:
That seems better. The values were read with the amp "hot," correct? Black lead of DVM clipped onto chassis, right? Amp on, speaker connected. No guitars plugged in. Volumes at "1."

But, what are your VDC readings at pin 2 and 7, of the 12AT7 phase inverter? Those should be close to the readings off the coupling caps.


Pins 2 and 7 on V6 read as follows:
0.010
0.026

10 minutes later
Pin (2) 0.022
Pin (7) 0.019

And the answer is yes to all your questions......what should i be looking for at this point?


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Post subject: Re: 1977 Deluxe Reverb - Nasty and Flabby - HELP
Posted: Wed Jun 21, 2017 10:21 pm
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Ryan41018 wrote:

Pin 1 284.6
Pin 2 46.96
Pin 3 61.44
Pin 6 284.1
Pin 7 48.69
Pin 8 61.45




So the red numbers are not correct? Latest values are good?


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