| jarthel |
seems very few of them. I've search the forums and have come across thorsten's one, the sun audio 300B PP.
thanks for the replies :) |
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| tube-lover |
pls considerate this, very very good sound.
Žg—p^‹óŠÇECC84, E180CC, 5AR4, 300B
ƒ_ƒ“ƒsƒ“ƒOƒtƒ@ƒNƒ^[4.5 (8ƒ¶ 1kHz +10dBV)ƒgƒ‰ƒ“ƒXAP-3001, A-4003, F-2021•‰‰×ƒCƒ“ƒs[ƒ_ƒ“ƒX0, 4, 8, 16ƒ¶Œ‹‡•ûŽ®C,RŒ‹‡ (ƒ€ƒ‰[ƒhŒ^)
Á”ï“d—Í210VA (100V, 2.1A, 0M†Žž)
Å‘åo—Í17W~2 (8ƒ¶ 1kHz)ƒVƒƒ[ƒVƒOƒ‰ƒtƒ@ƒCƒgF“h‘•AƒTƒuƒpƒlƒ‹•t“ü—ÍŠ´“x0.8V (8ƒ¶ 1kHz Å‘åo—ÍŽž)¡–@430(W)~240(D)~220(H)
Žü”g”“Á«4Hz`90kHz (-1dB 1WŽž) Š®¬d—Ê 21.6kg
•‰‹AŠÒ—Ê
8dB (8ƒ¶ 1kHz)‚’²”g˜c—¦ 0.2% ˆÈ‰º (8ƒ¶ 1kHz 1W)
ECC84, E180CC(MULLARD),5AR4 •W€‘•”õŽc—¯ŽG‰¹1.0mV ˆÈ‰º (8ƒ¶ •‰‰×Žž)ƒNƒƒXƒg[ƒN@-76dB (10kHz LÌR) 300B•Ê”„
thx
thomas
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| tube-lover |
U can considerate this outlook.
is 18wats was enough for U.
thx
thomas
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| kevinkr |
| 300B pushpull design article I wrote that was published in VTV in collaboration with Svetlana (they gave me sample 300B tubes to evaluate) back around 1999.. Link is on my site under amplifier projects. |
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| phn |
The http://www.audiodesignguide.com/my/pse2.html gets my vote, except PP.
That is, use the 417A or, better, 437A and a trafo phase splitter. The 437A is insane, performance (800 Ohms Rp and mu of +40) and price wise. But if you spend this kind of money, you can just as well spend another small fortune on the drivers. |
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| jarthel |
| quote: | Originally posted by tube-lover
pls considerate this, very very good sound.
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do you have a larger schematic? I can't make out the values.
thank you :) |
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| jarthel |
| quote: | Originally posted by kevinkr
300B pushpull design article I wrote that was published in VTV in collaboration with Svetlana (they gave me sample 300B tubes to evaluate) back around 1999.. Link is on my site under amplifier projects. |
any comment on the amp compared to your other amps?
thank you |
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| jarthel |
anyone knows how? the use of a pcb is very attractive. not needed as I've used p2p before but should save alot of hassle with case work and layout. |
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| jarthel |
| quote: | Originally posted by phn
The http://www.audiodesignguide.com/my/pse2.html gets my vote, except PP.
That is, use the 417A or, better, 437A and a trafo phase splitter. The 437A is insane, performance (800 Ohms Rp and mu of +40) and price wise. But if you spend this kind of money, you can just as well spend another small fortune on the drivers. |
no offense but I would like to stay away from WE because of:
1. availability
2. and because of no. 1, it also affects the price. though even if you have the $$$, I somehow doubt it would be easy to pickup a 417/437 |
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| arnoldc |
| but you don't need to use a 417A because the Amperex and Raytheon 5842 are equally good if not better. There pretty cheap here in the Philippines, so my friend hoarded all them 5842s :D |
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| tinitus |
Jarthel, you can contact PeteMillett at "pete@pmillett.com"
http://www.pmillett.com/ there is also a link in the middle of page
Its only a driver/supply board, so you stlll need a little p2p
I am no expert, but would expect main +B, heater and output transformer to be different, and a few other adjustments
maybe you can get a revised schematic
It seems to be very thoroughly designed, and I havent seen any changes or mods fore a very long time - I think it looks to be very neat amps
But I am not sure about 300B in PP, wont it loose its famous magic, and still have no punch - maybe a KT66 would be worth considering :clown: |
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| kevinkr |
tubelab built a variation of this design, I would see if you can find a post on it.. I don't remember the thread name exactly but it related to 300B PP amplifiers.
I've made the switch to SE 300B amplifiers, so unfortunately even given my personal bias I'm not the best one to comment on my design.. LOL I am aware of a number of copies being built and all who have built them seem quite pleased, but what exactly does that mean.. ;) ;) |
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| jarthel |
| quote: | Originally posted by arnoldc
but you don't need to use a 417A because the Amperex and Raytheon 5842 are equally good if not better. There pretty cheap here in the Philippines, so my friend hoarded all them 5842s :D |
where did he got them? raon? what shop? |
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| EC8010 |
| quote: | Originally posted by jane
Here is a sample of a 842VHD PPP. |
Just thought I'd say (because nobody else has), "That's a very pretty amplifier you've made there." |
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| phn |
http://electronics.search.ebay.com/...mZR8QQsacatZ293
And, no, I do not support WE's prices. But NOS 417As and 437As sell for a lot less on eBay than WE charges. And if you pay hundreds for a quad 300Bs, iron and whatnot, even the ultra high-price 437A looks affordable in comparison. Not to mention that it will last 20 years. Of course, the Russian 6C45P is reported to be equal to the 437A in every regard, save for the lack of a WE logo. |
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| jarthel |
| quote: | Originally posted by jane
Just some minor modifications (lower B+) and it can run with 300B.
Jan E Veiset |
what B+ should I use? how about 420V?
I in your schematic, you have a sowter 7483. I looked at sowter's site and I cannot find it.
I searched the net and I still cannot find it.
thank you. |
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| jane |
| quote: | Originally posted by jarthel
what B+ should I use? how about 420V?
I in your schematic, you have a sowter 7483. I looked at sowter's site and I cannot find it.
I searched the net and I still cannot find it.
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The power output depends on B+ so 420V will give you ~30W with two pairs of 300B. If you run the 300Bs at 75mA each or higher, you’ll have a true class A amplifier (B+=420V, Raa=3k)
The Sowter 7483 is a custom transformer based on Sowter 9083.
Jan E Veiset |
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| jarthel |
| quote: | Originally posted by jane
The power output depends on B+ so 420V will give you ~30W with two pairs of 300B. If you run the 300Bs at 75mA each or higher, you’ll have a true class A amplifier (B+=420V, Raa=3k)
The Sowter 7483 is a custom transformer based on Sowter 9083.
Jan E Veiset |
what are the specs of the 7483? and how is it different from 9083? |
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| jane |
| quote: | Originally posted by jarthel
what are the specs of the 7483? and how is it different from 9083? |
The 7483 is basically the same transformer as 9083 but with more iron. The size of 7483 is Sowter size H and the 9083 is size F. I think the performance is about equal. (I have 2 x 9083 that I will test next week in another amplifier).
The frequency response of the driver stage (8920->2xEL84->7483) is 20Hz to 50kHz +/-0.5dB at 70Vrms output.
Jan E Veiset |
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| jarthel |
| any more sample schematics? thanks again :) |
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