Tube DIY Asylum

RE: As long as the max rating for peak plate current is not exceeded you can use any cap value you want.

76.90.100.230

Tre'

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In Reply to: RE: As long as the max rating for peak plate current is not exceeded you can use any cap value you want. posted by sony6060 on July 24, 2023 at 10:13:39

they must have a large amount of DCR in the secondary of their power transformer and/or the current supplied must be comparatively small.

"Calculating is beyond most of us."

As I said, designing power supplies for audio circuits should be left to the engineers.

Question, which Cary Audio amp uses 470uf as an input cap in the power supply? Thanks.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

Follow Ups:

RE: As long as the max rating for peak plate current is not exceeded you can use any cap value you want. - sony6060 11:41:00 07/24/23 (10)
I forget the model Cary Amp, just remember the advertising bragging about the large cap 15 years ago. Iy is not a high resistance transformer. 1940 thru 1960 transformers hv secondaries were wound with high resistance. New transformers are much lower secondary resistance. I bet the Cary Audio transformer was less than 30 ohms HV secondary.

Using PSU2, higher capacitance capacitors actually add little additional peak to average current.
- RE: As long as the max rating for peak plate current is not exceeded you can use any cap value you want. - Tre' 12:14:42 07/24/23 (9)
  Just because the ad said there was 470uf of capacitance in the power supply that doesn't mean it was in the C1 (input cap) position.
  In a CLC or a CRC filter, the second capacitor can be much larger without causing problems because it is "hidden" from the rectifier by the L or the R.
  It is just the first C (the cap directly following the rectifier tube, C1) that we are concerned about.
  To know for sure you would have to look at the schematic.
  Tre'
  Have Fun and Enjoy the Music
  "Still Working the Problem"
  
  Edits: 07/24/23
  - RE: As long as the max rating for peak plate current is not exceeded you can use any cap value you want. - sony6060 12:27:32 07/24/23 (8)
    The schematic shows 470uF directly connected to the 5U4GB. Tre, why are you constantly trying to discredit all of my posts?
    - I'm getting ready to call BS on you. - Tre' 12:37:21 07/24/23 (7)
      Wait just a minute here. You said "I forget the model Cary Amp, just remember the advertising bragging about the large cap 15 years ago." and now you are saying you have seen the schematic.
      
      I'm not sure I believe you. are you just talking through your teeth?
      
      Maybe your posts need to be discredited. Show me the schematic or I call BS.
      
      Don't be making up shit.
      
      Tre'
      Have Fun and Enjoy the Music
      "Still Working the Problem"
      - RE: I'm getting ready to call BS on you. - sony6060 14:02:15 07/24/23 (6)
        
        In Reply to: RE: I'm getting ready to call BS on you. posted by Tre' on July 24, 2023 at 12:37:21
        
        You are a jerk. I saw schematic in a review 15 yeasr ago. Who knows where the review is. Go away.
        
        RE: I'm getting ready to call BS on you. - sony6060 14:15:23 07/24/23 (5)
        
        In Reply to: RE: I'm getting ready to call BS on you. posted by sony6060 on July 24, 2023 at 14:02:15
        
        Here it is Cary Audio SLI-80 as t came up on a search Cary Audio 5U4GB. It has two 5U4GB. Now, you will still say I am a liar without the schematic, but spec is below with PS caps.
        
        Edits: 07/24/23
        
        RE: I'm getting ready to call BS on you. - sony6060 14:19:29 07/24/23 (4)
        
        In Reply to: RE: I'm getting ready to call BS on you. posted by sony6060 on July 24, 2023 at 14:15:23
        
        Found this, shows 1200uF @ 450 volt capacitors in power supply as stated below. The original has two 1000uF @ 450 volt caps in series. See below:
        SLI-80 INTEGRATED AMPLIFIER
        Next
        Previous
        SLI-80 Integrated Amplifier
        Previous
        Next
        ABOUT THE SLI-80 INTEGRATED AMPLIFIER
        This item is replaced by SLI-80 Heritage Series (HS) tube amp and is no longer in production.
        The following section describes the SLI-80 basic specifications. The specifications are subject to change without notice or obligation.
        Circuit Type Push-Pull Ultra-Linear Pure Class AB-1
        Power Output 40 Watts - Triode
        80 Watts - Ultra-Linear
        Input Sensitivity .45 Volt for full output
        Noise and Hum -82 dB below full output
        Frequency Response 19 Hz to 23 KHz +/- .5 dB
        Inputs CD, AUX1, AUX2, Headphone jack
        Tubes 2 ea - 6922 Input Buffer Preamp
        2 ea - 6SN7 Pre Driver/Phase Inverter
        4 ea - KT88 Output Tubes
        2 ea - 5U4 Rectifiers
        Speaker Posts 5 way, gold-plated
        Tube Sockets Ceramic w/ silver pins
        Power Transformer 1 ea. - EI Laminate, Silicon Impregnated
        Output Transformer(s) 2 ea. - EI Laminate, Silicon Impregnated
        Resistors 1% Metal Film
        Capacitors Oil filled coupling, (copper optional)
        Power Supply Capacitors 2 ea - 1200µF @ 450 VDC
        6 ea - 10µF @ 400 VDC Film & Foil
        AC Cord 3 Conductor Shielded, Detachable
        AC Power Requirements 117/234 VAC @ 50/60 Hz
        Consumption 166 watts - Operation
        Warm-Up Time 3 Minutes
        Break-In Time 100 hours of playing time
        Finish Textured black steel chassis with machined, black anodized aluminum front panel
        Weight 42 lbs
        Dimensions 7″ H x 17″ W x 16″ D
        Now, stop calling me a liar Tre. I am sick of it.
        
        Edits: 07/24/23 07/24/23
        
        RE: I'm getting ready to call BS on you. - sony6060 14:27:45 07/24/23 (3)
        
        In Reply to: RE: I'm getting ready to call BS on you. posted by sony6060 on July 24, 2023 at 14:19:29
        
        Your you next BS towards me, the input choke. No Tre, there is no input choke on chassis as seen in picture. Where is your apology?
        
        Edits: 07/24/23 07/24/23
        
        I guess 40uf is not the maximum input cap value for a 5u4. Thanks for the info. - Tre' 15:10:45 07/24/23 (2)
        
        In Reply to: RE: I'm getting ready to call BS on you. posted by sony6060 on July 24, 2023 at 14:27:45
        
        I can only imagine how badly those rectifier tubes are being tortured.
        I would still love to see a schematic, there must be some kind a compensating measures being taken.
        
        Tre'
        
        Have Fun and Enjoy the Music
        "Still Working the Problem"
        
        RE: I guess 40uf is not the maximum input cap value for a 5u4. Thanks for the info. - sony6060 16:20:04 07/24/23 (1)
        
        In Reply to: RE: I guess 40uf is not the maximum input cap value for a 5u4. Thanks for the info. posted by Tre' on July 24, 2023 at 15:10:45
        
        To all friends of Tre stating I was full of BS, no apology from Tre. He still is defending the high capacitance with as he states a compensation network. There is no compensating network in this amp and Dennis Had the designer did make mistakes.
        
        Go away Tre.
        
        RE: I guess 40uf is not the maximum input cap value for a 5u4. Thanks for the info. - Rod M 17:13:45 07/24/23 (0)
        
        In Reply to: RE: I guess 40uf is not the maximum input cap value for a 5u4. Thanks for the info. posted by sony6060 on July 24, 2023 at 16:20:04
        
        Sorry, but I believe you might need to go away. Clearly, you can't supply any schematic or any other data to support this over the top back and forth.
        
        -Rod

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