Perfect. Nice work.
I tried embedding the image source but there is something up with the site coding.
Modifying a Coincident Dynamo Mk1
Hello all,
Have been modifying my Coincident Dynamo Mk1 for some time and I could use a helping hand from more experienced users.
If I understood correctly, looking at the image attached the 2 Epcos 22uf/500v are the filter caps which come after the rectifier (in my case the 5AR4) and these have to take into the account the rating of the tube and capacitance limit which is 60uf?
If my ramblings prove to be true can this position be improved on with better caps and/or a slightly larger caps?
Looking at the, what I think to be the power supply cap, which is a 470uf/500v, would there be a benefit in putting a larger cap without causing other issues? For instance the Mk2 Dynamo has much bigger caps in that position but I suppose the transformers are different as well. Id be looking to get more bass and mid bass and some readings say this is the place which can yield some results.
I have done several modifications already with mixed results so if anyone is interested I can share the details but Im trying to learn more about the positions and parts and their relative role. Any ideas and suggestions are welcome.
Link to insides below.
Thanks in advance!
https://ibb.co/JqW6JDb
P.S. For some reason the picture did not want to upload via the insert photo, sorry for the link.
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- 23 posts total
@imhififan to the rescue again, thank you! So Im still trying to understand if/what can be gained from increasing the two Epcos caps? Also can someone please confirm their respective name and role in the amp (some call the input supply, others power supply etc). If I understand their voltage ratings add up and the uF rating in this case is only half of the first caps value, being 11uF correct? This could leave room for a larger rating since the 5AR4 could endure more? As for the other single large cap, 470uF 500V, what is its role, what can it improve and is this the reservoir cap (any other names for it?) that @noromance suggested could be doubled if it does not impact the choke rating? Thanks for your patience guys.
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Two identical capacitors connected in series will double the voltage rating and halve the capacitance value. Two identical capacitors connected in parallel will have the same voltage rating and double the capacitance. As can be seen from the picture, these two 22uF 500V capacitors are connected in parallel, so the effective capacitance is 22+22=44uF.
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- 23 posts total