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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 9th July 2018, 08:00 AM   #1
anirban is offline anirban
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Default Starting on a SSE build finally

Does anyone have any recommendation on reasonably priced irons which can be bought in UK and delivered quickly ? long delivery times from sowter and their premium prices put me off the project last year
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Old 10th July 2018, 11:45 AM   #2
lowtherdream is offline lowtherdream  Canada
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Just did a quick search, but I do not know the products:
Valve Audio Transformers — Majestic Transformer Company
Lundahl - Canford
http://www.vvttransformers.co.uk/output_se_tx.htm

Hope it helps
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Old 10th July 2018, 12:39 PM   #3
zman01 is offline zman01  Bangladesh
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Starting on a SSE build finally
Are you planning to use any specific tube type (e.g. EL34, KT88) for your SSE build?

Here you go with a link for an OPT with 5K primaries which would work with quite a few tube types.:

TTG-EL84SE TOROIDY - Transformer: speaker | TME - Electronic components

I have no experience with their products though; it's a toroidal output transformer which is not common.

If using an EL34 or 6CA7 tube this power transformer from Hammond should work:

373BX Hammond Manufacturing | Mouser United Kingdom

Both are off the shelf components, so no manufacturing lead times involved.
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Old 11th July 2018, 08:54 AM   #4
anirban is offline anirban
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thanks for the response,

I will use the toroidy for a EL34 or 6V6 first SSE build


TTG-EL84SE TOROIDY - Transformer: speaker | TME - Electronic components

and if everything goes well, then will use hammond's with a SE board for 300B tubes

is there a current shared spreadsheet of the PCB parts somewhere with mouser or digi key part list ? might be useful to compile one and stick it on the forum as it takes so much time to build up the basket for PCB parts from this
Parts List | Tubelab
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Old 12th July 2018, 05:19 AM   #5
zman01 is offline zman01  Bangladesh
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Starting on a SSE build finally
Quote:
Originally Posted by anirban View Post
thanks for the response,

I will use the toroidy for a EL34 or 6V6 first SSE build


TTG-EL84SE TOROIDY - Transformer: speaker | TME - Electronic components

and if everything goes well, then will use hammond's with a SE board for 300B tubes
anirban,

Sorry if I have misunderstood, but please note that you will need both output transformers (such as the Toroidy transformers in the link that was provided) and a power transformer with required voltage taps and rating (such as the Hammond 373BX).

Also please note that with a tube amp you will be dealing with very high (lethal) voltages - so please proceed with extreme caution.
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Old 12th July 2018, 10:52 AM   #6
anirban is offline anirban
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yes thanks for the caution, I have been prepping up with 2 multimeters, sleeved screwdrivers and reading up on discharging on capacitors etc

also I have been trying to find out a way to separate out the OPT (in its own power supply chasiss) from the PCB + 2 audio transformers , then find a way to make the setup plug & play - basically I had ordered a couple of SE & SSE boards and want to test out the combinations of a 300B & EL34
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Old 12th July 2018, 06:00 PM   #7
zman01 is offline zman01  Bangladesh
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Quote:
Originally Posted by anirban View Post
also I have been trying to find out a way to separate out the OPT (in its own power supply chasiss) from the PCB + 2 audio transformers , then find a way to make the setup plug & play - basically I had ordered a couple of SE & SSE boards and want to test out the combinations of a 300B & EL34
anirban,

You will need 2 x OPT or Output Transformer (one for each channel) and 1 x PT (Power Transformer) for each amplifier.

I recall one TSE builder (boywonder?) who did a 2 chassis amplifier - PCB with 2 x OPT in one chassis, power transformer housed in another chassis. Doable, but there is extra effort and cost involved.

Also please note, that for an EL34 SSE build, you will need a power transformer within 700VCT - 750 VCT rating. For 300B tubes you will need a PT around 650VCT rating - so basically you cannot use the same power transformer for both projects.
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Old 12th July 2018, 06:11 PM   #8
anirban is offline anirban
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sorry meant it to be PT and OPTx2 + PCB
and have been going thru boywonder's posts, his amp pic's are awesome

so if I go for a PT 700VCT - 750 VCT, can I not use it for both 300B and EL34 ?
I have to readup on power transformers
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Old 12th July 2018, 07:08 PM   #9
zman01 is offline zman01  Bangladesh
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Starting on a SSE build finally
anirban,

Please refer to the following page - for 300B tubes Tubelab recommends a 640-650VCT power transformer:

Tubes and Applications | Tubelab

A 700VCT PT might be too high for a 300B tube. And 300B tubes are quite pricey!
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Old 12th July 2018, 09:55 PM   #10
anirban is offline anirban
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ha ditch that idea, a variac with that kind of output for PT is expensive,
I will go for a simple PT with Hammond 373BX and 2 toriody for a SSE 300B
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