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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 24th March 2020, 07:49 PM   #1
bigdh31 is offline bigdh31  United States
diyAudio Member
Join Date: Feb 2007
Location: Powell. TN
Default Ready to test SPP

I built it with el84 tubes wired ultralinear and 5ar4 rectifier. The power transformer is an Edcor XPWR008. What would be a good fuse amp rating for testing? If testing goes ok what value fuse would be good for long term use?

To me this amp was a more difficult build than the two sse's I have built because of all the connections, more output tubes and transformer wires, so I am trying to proceed with caution.

I did not put the feedback caps in place yet as I am not sure what they do or if they are needed.

The output transformers are Edcor CXPP25-MS-8K/23% which have 4/8/16 ohm taps. I attached the feedback to the 8 ohm tap.

Any tips or comments would be appreciated.

I put it in a pessant 3u chassis from diyaudiostore. Here is a photo:
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Old 4th April 2020, 11:56 PM   #2
Steve Morley is offline Steve Morley  Canada
diyAudio Member
Join Date: Jan 2015
Location: Georgian Bay
See my SPP build series in the link below. Start with attachment 2. If the pictures look funny it's because I put some components, including the terminal strips, on the bottom of the chassis.


DIY EL84 Project, Part 5: Optional Volume Control and Input Switch Assembly, Power-Up and Testing | Wall of Sound | Audio and Music Reviews
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