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Old 31st March 2014, 08:12 PM   #1
prezden is offline prezden  Canada
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Default TDA7297 and Karlsonator

I wasn't sure where to post this and hope I haven't broken any rules regarding posting in 2 forums.

I've built a new stereo comprising a TDA7297 amp and a 12AU7 Valve Cmoy Headphone for preamp. The speakers are a pair of foam core Karlsonators with TB W3-881SJF drivers.
It is really quite remarkable how remarkable this little little set-up sounds.
It was great fun to build- hope you enjoy it

cheers
Attached Images
File Type: jpg stup and kar.jpg (305.7 KB, 783 views)
File Type: jpg stupa amp.jpg (472.8 KB, 745 views)
File Type: jpg karlsonator.jpg (450.2 KB, 724 views)
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Old 1st April 2014, 01:13 PM   #2
xrk971 is offline xrk971  United States
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Do you have any photos of the amp and preamp internals? Looks very nice! Glad that it sounds good! The Karlsonator is a remarkable cabinet for sure - one of my favorite full range enclosures with lots of satisfying bass and mid range.
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Old 2nd April 2014, 02:48 AM   #3
xrk971 is offline xrk971  United States
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I just ordered a pair of the TDA7297 amps for $5.37 ea shipping included from Aliexpress. I am prepared for a 2 month wait though so it will be fun to get it any sooner than that. These are actually class A/B chips amps so maybe this thread needs to be in Chipamp forum?

http://www.aliexpress.com/item/AC-DC...590579320.html

Last edited by xrk971; 2nd April 2014 at 02:50 AM.
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Old 2nd April 2014, 05:57 AM   #4
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Quote:
Originally Posted by prezden View Post
I wasn't sure where to post this and hope I haven't broken any rules regarding posting in 2 forums.

I've built a new stereo comprising a TDA7297 amp and a 12AU7 Valve Cmoy Headphone for preamp. The speakers are a pair of foam core Karlsonators with TB W3-881SJF drivers.
It is really quite remarkable how remarkable this little little set-up sounds.
It was great fun to build- hope you enjoy it

cheers

Fun. Very creative build.
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Old 2nd April 2014, 04:52 PM   #5
prezden is offline prezden  Canada
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Hi X
I will take some photos of the inside. The bottom section with the amp in it is a bit of a mess. I couldn't figure out a good way to run the wires inside.
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Old 15th April 2014, 12:24 AM   #6
xrk971 is offline xrk971  United States
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Default Lunch money amp rocks!

Prezden,
My TDA7297's just arrived from China. $5.36 ea shipping included! It really is a lunch money amp (What the heck? It's less than lunch!) but last a lot longer than 1-meal. I hooked them up to my 0.4x Karlsonators (Mini Karlsonator (0.53X) with Dual TC9FD's) and a 19 volt laptop brick and using my phone as the source. The amp sounds great! Very nice detailed sound, great bass, overall very neutral. I am used to class D amps though and almost burned myself when I picked it up by the heatsink after blasting at high volumes.
A fantastic deal anyway you look at it. The heatsink, 50k dual pot, or terminals would all cost about $5 ea to buy from one of the electronic parts suppliers in the US.

Wondering where they will live now... maybe as a powered mini Karlsonator mp3 player?
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File Type: jpg Lunch-money-amp-Karlsonator.jpg (181.9 KB, 659 views)

Last edited by xrk971; 15th April 2014 at 12:42 AM.
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Old 15th April 2014, 05:37 AM   #7
xrk971 is offline xrk971  United States
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I just tried the lunch amp with the 0.53x scale Karlsonators with the dual Vifa TC9FD drivers (91dB efficient), wow! It sounds amazing. There is a certain visceral depth and presence that just grabs and engages you and you want to hear more. This is a bone stock amp and I think improvements are readily available with input caps swapped to poly foil, Panasonic FC power cap, and removal of pot. But even in stock form, I really like the sound.
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Old 15th April 2014, 10:17 PM   #8
pkozul is offline pkozul  Australia
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Quote:
Originally Posted by xrk971 View Post
I just tried the lunch amp with the 0.53x scale Karlsonators with the dual Vifa TC9FD drivers (91dB efficient), wow! It sounds amazing. There is a certain visceral depth and presence that just grabs and engages you and you want to hear more. This is a bone stock amp and I think improvements are readily available with input caps swapped to poly foil, Panasonic FC power cap, and removal of pot. But even in stock form, I really like the sound.
Hi there X. How would you say the sound compares to the TPA3116?
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Old 15th April 2014, 10:50 PM   #9
prezden is offline prezden  Canada
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Hi X
Here's a few photos of the stupa amp. As you can see the inside of the bottom compartment is a bit of a wiring knight mare
I'm thinking of building another one with the 3116 and see how they would compare. So far I refer the sound of the 3116 but they are both pretty incredible.
Attached Images
File Type: jpg stupa amp.jpg (579.8 KB, 602 views)
File Type: jpg sa top pre.jpg (426.3 KB, 201 views)
File Type: jpg sa amp.jpg (479.3 KB, 231 views)
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Old 16th April 2014, 03:35 AM   #10
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by pkozul View Post
Hi there X. How would you say the sound compares to the TPA3116?
I have not had a chance to do an A/B test with same speakers and same source yet. But initial impression is that it is very nice but you can hear more distortion at higher volumes. The TDA can get about 20 watts at 1% THD with 19 volt PS whereas the TPA3116 can get 40 watts at 0.1% THD. So they are in different class altogether if you push them hard. However, if you play them both at moderate 8 watts/channel they sound quite similar with the TPA appearing to have better bass, clearer highs, and more clarity in general. But at $5, it is an amazing sound that is I would say about 80% of the TPA.
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