1964 Fender Deluxe Reverb plate voltage question...

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1964 Fender Deluxe Reverb plate voltage question...

Postby page361 on Wed Apr 12, 2017 6:53 pm

Hello!

Working on my 1964 Deluxe Reverb - just changed power filter and bias caps - cathode caps on the board still original...at 120vac the plate voltage sits around 409vdc...tubes biased at approx 21 mAh.
tried various NOS 6V6''s and a known good Mullard GZ..results the same no matter the tubes. Of course if I use my BrownBox and run amp at 117v...plate voltage drops even more (as expected)
I know that normal operating voltage is around 420vdc...should I be concerned that the PT may be taking a dump on me or am I worried over nothing? What else can I check?

Thanks!!!!!
page361
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Re: 1964 Fender Deluxe Reverb plate voltage question...

Postby stratele52 on Wed Apr 12, 2017 9:03 pm

You only change filter caps and bias caps right, nothing more .
Check if all filter caps are solder the right way, the plus + and the minus -
Solder are good ? Not sure , reheat them with lead.

Check if your 6V6 are good, some short in these tubes may drop plate voltage. You may unplug them and see voltage raise a bit ( 5 -10 Volts ? = normal )

Power transformer; read heater voltage; close to 6.3 ac volts mean PT is good. With all tubes plug in.

If all are good/ normal , forget that and enjoy :cheers:
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Re: 1964 Fender Deluxe Reverb plate voltage question...

Postby page361 on Wed Apr 12, 2017 10:23 pm

Polarity on all caps are correct - solder joints good. Swapped out the 6V6's ,,,,will check heaters,...and then if all else fails I'll indeed take your advice and FAH-GET about it!
page361
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Re: 1964 Fender Deluxe Reverb plate voltage question...

Postby stratele52 on Wed Apr 12, 2017 10:30 pm

page361 wrote:Polarity on all caps are correct - solder joints good. Swapped out the 6V6's ,,,,will check heaters,...and then if all else fails I'll indeed take your advice and FAH-GET about it!



+1
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Re: 1964 Fender Deluxe Reverb plate voltage question...

Postby page361 on Fri Apr 14, 2017 1:12 am

3.3vac on the heaters...dang.
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Re: 1964 Fender Deluxe Reverb plate voltage question...

Postby page361 on Fri Apr 14, 2017 1:17 am

Any recommendations on a rewinding service?
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Re: 1964 Fender Deluxe Reverb plate voltage question...

Postby slider313 on Fri Apr 14, 2017 2:40 am

How did you measure the heater voltages?
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Re: 1964 Fender Deluxe Reverb plate voltage question...

Postby stratele52 on Fri Apr 14, 2017 8:22 am

page361 wrote:3.3vac on the heaters...dang.



3.3 AC volts is from the ground IMO ? If yes. it is normal. PT is good
Directly on tube you may read 6.3 AC volts or close, less than 6.1 AC, PT may be bad or have too much load on it

With a very low voltage on heater, amp will amp very low power output . Page 361 don't compalin about that
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Re: 1964 Fender Deluxe Reverb plate voltage question...

Postby page361 on Fri Apr 14, 2017 1:32 pm

Yes - I measured heater pins to ground...this is good news!
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Re: 1964 Fender Deluxe Reverb plate voltage question...

Postby stratele52 on Fri Apr 14, 2017 5:40 pm

Enjoy your amp :cheers:
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